I would argue that "no financial stake" is not a good metric because basically all experts have a financial stake in their area of expertise.

A financial stake is usually about making a profit. The Gates Foundation is not going to make any profit here, it's looking at funding vaccines at super low cost and giving them away or the manufacturer selling them for as little as possible to governments who would give them away. I hated Gates the monopolist and the foundation has messed up on a few questions (see: efforts in Education), but how in hell can you say that it has a financial stake? If anything, the most successful people are at finding a solution, the more he's going to deplete the coffers of the Foundation, as a vaccine manufacturing force multiplier.