My org's GitHub Enterprise never goes down. The feature set is almost the same, though it lags a few months behind. At least you don't have to learn anything new.
I'm assuming you mean Enterprise Server (non-cloud), because my GitHub Enterprise Cloud is down right now.
My previous org’s GHE went down all the time. It couldn’t handle the CI and automation tooling hitting it as often as an org of our size needed it to. So I can totally see cloud not being able to handle the new AI scale