He's just starting the project, if you check his page he doesn't even have any binaries yet. So currently it's more like "Hey, subscribe to my Patreon if you want to support my work, and in the future I'll make some bonus content for subscribers when it's ready". Which... well, some people actually do follow through on commitments like that, so really it depends on how well you know and trust the person involved whether you'd want to subscribe to a Patreon like that. Similar principle here, it looks like.

(I have formed no opinion, positive or negative, on WinTTY yet, BTW, so don't take this as either an endorsement or a... whatever the right word for anti-endorsement would be).