For the amount of money enterprises are paying to GitHub, there is a reasonable (and contractual) expectation of uptime. I don't think my boss would find it to fun if I bailed work to hit the gym just because GitHub was down.
Edit: it seems GHE is also affected by the outage and isn't much better.
- we are getting no benefit beyond getting excuses replies to our emails - right or wrong, but we depend heavily on GitHub actions so this has a very real impact on us
There is no separate enterprise platform unless you buy their self hosted server product.