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.
Friendly reminder GrapheneOS relies on donations from those who realize the value it provides! https://grapheneos.org/donate