As I said elsewhere, it's not. It's an open source project, under the Linux Foundation umbrella, with all of the good licensing that goes along with that. It has some contributors who are also IBM employees, but to say they're "funded by IBM" is a bit of a stretch.
FWIW, most of the code and docs contributions have come from non-IBMers [0]. That said, IBM has done a lot of great work building the foundation and initial community and without them, OpenBao wouldn't be here. :-)
Speaking for myself, but I do not get any monetary compensation from IBM and I suspect this is true for all of the other non-IBM contributors.