Also Cassandra, RocksDB, zstd, Open Compute and probably a bunch I'm forgetting. Meta has one of the most stellar open source contributions of any company.
These people are only one reorg away from losing their income, Mr. lz4/zstd should be able to focus on his work without such fears, so great is his contribution to our field.
That the direct-corporate-patronage/semi-employeeship model is so prevailing is a sign of brokenness. We need more, collectively, to have a health of our technical ecosystem.
Having these corps willing to hire great folk & have them keep hacking is still often a good option, often. "Create more vue than you capture" is easy to back/do when it's so clear who is out there creating mad value.