I'm always dubious of freemium software, because the free version is always gimped in some way, be it SSO compatibility (OK, yours supports OIDC it seems so that's not _terrible_), role-based access controls, high availability, etc.
I will concede that businesses probably _should_ be paying for good software that is critical to their business to help support the vendors, but given how important cost savings are to companies these days, one can hardly blame engineers looking for cheaper offerings.