I've never had issues at all. I use their consumer offerings (iCloud, Apple Music, Apple TV+, Apple Arcade, etc.) and I've never personally witnessed an outage or problem. I regularly transfer stuff to iCloud from my PC running Linux, and I use the email service with a custom domain that used to live on Google until Google canceled the free tier of small business and also raised prices on the paid tier.

It’s a bit hidden, for example if Apple Music isn’t working it will act as if my device is having an issue with the app playing; it doesn’t look like its a service problem because it hangs and freezes the UI for play- and pretty often I will force my mail to refresh and it will say the imap server is unreachable.

Regardless, these kinds of things tend to be somewhat regional. I’m based in Sweden.