According to their overall status page, they already do run two separate CDNs for normal and enterprise customers: https://www.netlifystatus.com/
Ostensibly they do seem to have that.
> Our non-enterprise CDN is failing a small number of page loads, usually with SSL errors; Enterprise CDN is not affected.
But looks like there's room for improvement, because the enterprise CDN ended up failing as well.
> We are still working to mitigate the effects of these problems and do see some page load failures on the enterprise CDN as well.
The build pipeline was down for several hours a few days ago, now a CDN outage makes things much worse, as it's taken down all our sites.
I'm sure they will resolve things quickly, in the meantime our clients will start asking about other failover options.