MariaDB plc has some really talented C++ engineers who are experts in database internals. Their DB has some compelling features that many competitors lack, for example system-versioned tables, Oracle DB compatibility layer, and soon a really nice multi-tenancy feature (catalogs). MariaDB plc has a strong presence in Europe, which I would assume is very appealing for potential European customers. And now they finally have an owner with deeper pockets, which hasn't been true in recent history; their previous financial state likely hindered commercial adoption.
If MariaDB can execute well on support and services, I'd imagine their new owners can get a good return on their investment as-is. No need for squeezing and strip-mining them, I don't see how that would even work in this case.