Some open source projects list commercial support vendors. I don't immediately see one for Keycloak.
Interestingly, it doesn't show up at
https://www.openlogic.com/supported-technology?field_integration_weight_value=All&page=11 but we do support keycloak. I'm not a sales person, so if you have a query in that regard, just fill out the form.
As far as the industry standard, I'm not really sure what you mean. keycloak is a Red Hat project, so I suspect their support is very good. I have never used their support, so I don't know how it compares to ours in any respect. Like Red Hat, we are a US company, so we would have the same export restrictions for Iran, etc. I'm not aware of any other vendors, but I would anticipate others exist.