Most DNS hosting companies do not support ALIAS records, which is crucial when your website is configured to use the bare domain, e.g. example.com compared to www.example.com. When using a CDN the users needs to be routed to the closet PoP which requires the use of an ALIAS record.
section.io offers free DNS hosting (that supports these ALIAS records) for your domain, and you’ll need to transfer all records (CNAME, MX, TXT, etc.) over to the section.io portal before changing your name server records.