It's great for the author that their site was able to withstand the load, but it's ridiculous that this issue has existed for years. Mastodon is incredibly spammy and it seems like the dev team just doesn't care. They also send Delete messages to any server they know about, even if that server isn't an AP server and has no relationship with the originating server. My website is not an ActivityPub server, but i get thousands of spam messages from mastodon servers a day. I've filed two different issues related to that but neither of them has received much attention (and none from garg).