While it's sad to see a successful GPL3 software sell out and change license, TerminusDB might not be worth spending much time crying over. https://www.dbdebunk.com/2019/03/graph-databases-they-who-forget-past.html

One place where FOSS can't take the high ground is in software engineering competence. FOSS is stuck in the same coding mentality as the closed source world.