Redis is no longer free software

I'm kind of assuming that Redis Labs/Ltd. came into existence to directly support the author of the Redis software - though, he's no longer with them it seems - and continues to support all, or at least the bulk of, Redis developers.

But even if that assumption is incorrect, and Redis Ltd/Labs itself is also taking advantage of the software devs, my question still applies generally: What is the correct structure - legal entity and licence wise - to support the developers of some Free Software.

(I myself once worked for a 501.3c that had - I /thought/ - been setup to support the Free Software I helped maintain; but only for about 6 months - and now I think that kind of structure is not really ethical, and certainly at risk from perverse motivations and conflicts of interest).