This is really cool, and I'd like to encourage work like this. I currently don't think I can recommend this to others because:

It isn't immediately obvious who is running the site. whois info lists a Canadian privacy company. The site doesn't have an about page. Github has contributor info, which may help. Tax returns need to be private and accurate. If it's hard to verify that the authors are even in the US, it's had to know if this is a scam.

I think the project is still young, and the above is likely something addressable. Partnering with some accountants may be a way to fund further development/maintenance through referrals. Good luck!