I didn't say that it has to. It's my choice to choose an option that respect my freedom. I have no issue with Arctic and it being proprietary. I simply use it to test the client and not interact extensively with the fediverse. One of the reason I like the Fediverse it's because it's Free Software as in Freedom, and that's the same reason why I like Free and Open Source Clients for the Fediverse. I use proprietary software in my life and I can live with that.