exactly, frequent releases of engaging content is the name of the game (NLT produces 2 releases per month).Many devs have the intention to milk donators more or less, if the game goes to the end and it's quite popular (i.e. they have enough patreons). Sometimes its just a bit annoying, sometimes it angers ppl AF. If they go too far - they just start to loose support.
To think carefully - why NLT games mentioned above are so popular? I can't say the storylines and h-scenes of their games are absolutely brilliant. High-quality and well-thought-out, but not outstanding. The main reason of their high popularity is just very strict release schedule.
Does not have to be best content, just good because as long as you release often you get Patreons and have a winning business.
and it's logical: I think a lot of Patreons think it's a good deal to get 2 releases for every month they pay...