As the statement says I wont - it will be fully discontinued. This statement applies to the official app only. It doesn't say anything about other apps or forks - any existing once can and hopefully will continue to exist. Also all the code is free.

I am not the creator, funnily that is/was one of the Lemmy creators: Nutomic :)
I am a syncthing co-maintainer that kept the android app on life support since a while.

It's all in the open, you can go dig around for reasons. As usual there wasn't a single simple one. Neither was it some kind of complete fallout, we e.g. collaborated on translations and I have been in contact around various things with the one that forked.

Oh don't worry to much, mine too: If there wasn't an alternative for syncthing on android, I might have kept it on lifesupport :)

What?! All that noise about Switzerland mandating usage of open sourced software in gov (there was a great step, but it's far from mandating anything) was already weird, now we are switching to linux? And caring about security and fiscal responsibility? There has to be another country called Switzerland than the one I live in.

Yeah that sounds good too, but it's not the same thing. I just want a client side filter for lists of communities. No need to involve AP or get consensus amongst many users/communities, just my preferences. If we want to get fancy, have some APIs to store these lists server side so or can with across clients - still strictly single user. It feels so simple I am tenors to get my hands dirty, but for one diving into a new project is usually quite since work and it hardly ever turns out to be as easy as it seems (then again the new python lemmylike thing already has it instance wide, so it at least is doable).

Technically that wasn't the initial entrypoint, paraphrasing from https://mastodon.social/@AndresFreundTec/112180406142695845 :

It started with ssh using unreasonably much cpu which interfered with benchmarks. Then profiling showed that cpu time being spent in lzma, without being attributable to anything. And he remembered earlier valgrind issues. These valgrind issues only came up because he set some build flag he doesn't even remember anymore why it is set. On top he ran all of this on debian unstable to catch (unrelated) issues early. Any of these factors missing, he wouldn't have caught it. All of this is so nuts.

Outlook (no I don't want it) (still) (really not) (WTF I SAID NO)

Looks like a federated wiki, which is great. And not a Wikipedia alternative. What makes wikipedia wikipedia is not the tech. Social and knowledge problems can't be solved with tech ;)
As much as Wikipedia has issues, as the ibis announcement states, it also works in many places. And federating it won't help with the issues of bad moderation, quite the contrary. And as much as I like nutomic (thanks for syncthing-android ;) ), I don't hear many good things about the lemmy moderation story. So I have my doubts. Lets hope I am wrong. Plus anyway, federated wikis is a great thing to have, ignoring the whole Wikipedia aspect.

Is this a case of !whoosh@lemmy.zip on @douz0a0bouz and bunch of upvoters part, or on mine?

This is an expected statistical artifact given the "last month" aggregation and a huge influx of new users of which many don't stick around. I am saying they don't stick around, because that's generally just what happens with a lot of new users (e.g. they checked it out, decided it's not for them) and also due to the federated nature they might have switched accounts and similar things. Then the bit about "last month" aggregation: Have a look at the "Active 6 months" graph - it's still trending upwards. Those are likely a trailing average aggregations, so a maximum is reached when that 1-month-window starts (roughly) at the beginning of the huge user influx. For the 6-month window that hasn't happened yet, so still going upwards. Assuming nothing changes (similar amount of new/leaving active users) the graphs gonna be interesting in the next few weeks: After the initial wave of influx the balance was most likely negative (more users from "the wave" dropping out again than added users afterwards), however I'd hope it's gotten positive since then. If that's the case the graph should start trending upwards 1 month after the balance became positive. It's unclear when that was the case, but some towards end of July might be a reasonable guess? The same graph with a smaller window could shed some light on that (or just expose useless noise ¯_(ツ)_/¯ ).

Another sign I'd consider good: The active user ratio is trending upwards.

Disclaimer: I don't know how the data is aggregated, nor how exactly "active" is defined - the gist of the above very likely applies though. I was too lazy to look it up in the code - if someone knew how these graphs are aggregated and were so kind to let me know, that'd be appreciated :)