Comment by tyingq

It applies to any service where having them host your domain is done by publishing a CNAME record.

But, that's not the only way to do that sort of thing. Firebase, for example, allows you to use A records pointing at their IP addresses.

Cloudflare and WordPress.com allow you to make them the authoritative server for all your records, then they provide an edit interface.

Netlify doesn't mention these as good options, probably because they don't have them to offer.

Edit: Apparently they do offer these options, but have their own reasons for preferring the CNAME approach