"Getting Jeff'd" is only an existential crisis if your goal is to own the majority of the pie. Postgres's contributors come from a bunch of different companies who all manage to make enough money off of Postgres to pay them [0]. That is the only financial metric that really matters for funding a FOSS project.

The problem with these companies is that they actually were trying to make large returns for shareholders rather than simply earn enough to keep paying the developers.

[0] https://www.postgresql.org/community/contributors/