In this case it’s Google, which has an interest in propagating use of the WebP image format it created. It would be fair to also note Automattic as the employer of the core contributors putting a hold on WebP by default.
I think we’ll probably see more of this kind of thing, and it’s a good thing. Decisions are being proposed, argued, and decided in the open. Participants have been civil.
Say what you will about the heavyweights behind the code and decisions that go into WordPress core, it’s better than them not contributing, and it’s good for them to have honest, open disagreements. This is open source at work.