I'm not really a GitHub user anyway, but that to me is a complete red flag. Even if you completely trust the company is doing the right thing with regards to b

I'm not really a GitHub user anyway, but that to me is a complete red flag. Even if you completely trust the company is doing the right thing with regards to being a man-in-the-middle by design, you're also dependent on them being financially successful and interested in this platform for the app to be useful long term. Honestly the 'server' part sounds like a solution looking for a problem.