I can entirely understand it too but considering how others work like the example FurryVNE that not only has all progress info locked behind subscription and at the moment they dropped the animation update they did it soo by putting anti-piracy on it, i would say this is one of the more legit ones.to be honest, I don't blame people for being sus about this type of stuff considering how much people do milk their patrons, but since he's a solo developer and building an entirely new engine plus giving in-depth updates semi-consistently. there are worse ways to spend your money considering some of the shit I've seen on here
Also as i said, if there was some fuckery here a tech-savy person would already pointed it out how it doesnt work like that.