I've experienced a ton of issues, but it's likely because almost every aspect of our operation depends in someway on GitHub -- the repo itself and basic push/pull, or PRs, or webhooks, or actions, or some aspect of status updates, or random API tasks, etc. We use a lot of GitHub.
Yeah I can see how the more tied you are the more exposure you would have, especially for very frequent / long running tasks and etc.
My exposure is increasing, but it's still intermittent / not stuff ongoing all the time and if it doesn't work ... oh well it will run later when it does. So the impact is lower than some.