> Most commonly the restrictions prevent you from launching a competing offering. In their case, you can't offer database-as-a-service using their code.
Meaning the self hosted version is free to use in any number of servers having in mind the competing offering restriction.
Even though software may be licensed under "BSL" it isn't really a standard, even though proponents tend to use the term "BSL" as if it is the same as talking about "GPL" or "BSD". The MariaDB BSL used here is quite different than the HashiCorp BSL, for instance.
Additional Use Grant: You may make use of the Licensed Work, provided that
you may not use the Licensed Work for a Database Service. A ‘Database
Service’ is a commercial offering that allows third parties (other than
your employees and contractors) to access the functionality of the Licensed Work.