> There also seems to be a lot of ‘privacy’ tools popping up on github lately.

FWIW, O&O ShutUp10 dates back to 2015, with the launch of Windows 10. This isn't v10, it's "Shut Up, [Windows] 10!".

O&O Defrag has been a trusted tool since 1998.

That said, I largely agree with "No source code? No thanks." as I don't want to worry about a private equity group buying O&O Software and doing with it what they will.