this is a big nothing. they relicensed the previous cal.com as cal.diy (MIT by the way, instead AGPL or something else) and effectively forked their own product into the "new" cal.com. anyone who cares would just use cal.diy as they were prior to this announcement with cal.com

We’d hope but they could neuter Cal.diy over time. From their chart between the differences of cal.diy and cal.com, teams are not supported. I’m self hosting Cal.com and I think I do have access to teams as of right now.