Giving OSI money isn't giving Redis Labs money. I don't imagine OSI will be sending any of that money Redis Labs' way. On the other hand, OSI's activities will benefit its sponsors. One way: by constraining approved terms to licenses, like ancient permissive licenses, with poor upstart-business potential, but all the permission grants established enterprises require to mulch the remains of dead startups that result.
I'd be willing to bet Redis Labs is contemplating return to ash pretty seriously these days.
More contributions will not solve the problem. They may defer RL's trip into liquidation, but at the expense of a quicker boot out of the top spot on their own project. That, in turn, bodes ill for acquisition. Even if outsiders reduce maintenance and development cost to $0, that's savings, not earnings or recoupment.