Unfortunately they tend to be unusually flaky as well, hence why there are so few finished furry games compared to general pron. But you're 100% right, they have weirdly crazy skill ceilings and even unfinished many of those games are incredibly promising.
Just wish that promise would blossom more often, lol. So many interesting projects abandoned or in remaster/remake hell. Never got how you could remaster or remake a game that was never finished to begin with, but whatever...
Don't follow the game so not sure about the updates, but he's not lying about them making mega-bank at least...
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Even at the low end, that's over 80k a year and it's very likely not all mid subs and that's not including subscribe star subs. I dunno, that's a lot of money, especially if they don't live in the US and that money goes further for them. Not sure about 5 five-time devs with that amount, though, unless he's earning on the top end which would be over 200k a year.
Regardless, with that much support, I'd expect frequent updates regardless of how he decides he wants to make it work unless he clearly stated he refuses to work fulltime on the game, is insistent on keeping it a hobby, and folk are free to pay what they want as random tips with the knowledge that he's taking his time.
That would still be a lot of money for a game that doesn't update often imo, but maybe that's just me...