Every service that puts SSO in an enterprise tier is a security risk and shouldn't be touched with a 10 foot pole.
Go ahead and put Kerberos and SAML and maybe even LDAP SSO in Enterprise tier, but if you put OIDC in enterprise tier, you're responsible when your customers will get inevitably hacked.
Only big corporations need security, after all, if a small company gets hacked, well, they should've paid more?
What kind of late-stage capitalism is that? You're knowingly selling an insecure version and somehow it's the customer's fault they didn't buy the "actual security" addon?
It would be a shame though if you demanded unpaid work from others, but didn’t live by the same rule yourself.