Thank you for raising this. My subscription was up for renewal next year, and I think I’ll look elsewhere now.
The only reason I chose to support S Notes in the first place is they were the best designed FOSS notes app at the time, and 4 years later they have plenty of competition in that space fortunately. Honestly I expected better from them, they say all the right things but I guess the greed just got too much for them.
I’d say there’s a darn good point if Meta doesn’t want you to use one.
There used to be a great frontend for Instagram that was sued and forced to cease development when all it allowed you to do is browse Instagram on an account in this private frontend app.
EDIT: here it is https://austinhuang.me/barinsta.html