Not really. Also by your logic you can’t trust anyone ever because there is always a risk they turn bad at some point in the future. All we can do is evaluate what we have in front of us at the moment. Current evidence suggests Ruud is trustworthy, committed and capable of running a large Fediverse instance.
The thing to get across to people is that you don’t need to understand it to use it. Hell, that goes for most things. The average person has no idea how an internal combustion engine works but can drive a car just fine.