Are third party lenses good on canon ef?

Here is what the site says about that.

From Canon EOS R50: Adapting lenses: EF and EF-S lenses from Canon DSLRs work fully, autofocus included, through Canon's EF-EOS R adapter. Canon licenses only some third-party autofocus lenses for RF, mostly APS-C ones so far.

From Canon EOS R100: Adapting lenses: EF and EF-S lenses from Canon DSLRs work fully, autofocus included, through Canon's EF-EOS R adapter. Canon licenses only some third-party autofocus lenses for RF, mostly APS-C ones so far.

Quoted from this site's pages.