(I work for a competitor in the same space as grinich.)
Charging for scim is a convenient way to segment customers, the same way SLAs are. For companies that care deeply about controlling user access (or are forced to by law or regulator), that isn't much money.
Features like this subsidize the free/cheap version, which you can then offer to let folks learn about and love your software, and use. After all, you can replace scim with careful manual processes until you get to a certain size.
> Charging for scim is a convenient way to segment customers
It’s also a convenient way to keep charging non-SCIM customers for unused licenses when they inevitably forget to manually nuke accounts belonging to leavers.