That is not how standards work. Some for sure, but the majority are established by groups of companies / a guild establishing rules. The law pressures them often into it (e.g. the EU did not say USB-C port, they said: one standard, you industry figure it out).

There are surely exceptions (maybe the IEEE; which are professionals union).

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They claimed and showed QUIC slightly-to-moderately reduced latency, particularly for mobile. This benefits Google by loading pages with third-party content, i.e. ads, faster.

But QUIC significantly increases CPU utilization on servers, at least the widely used userland stacks do. Unless/until Google deploys QUIC in the kernel (or puts the whole network stack in userland, a la DPDK), this won't change.

The multicast claim is kinda bizarre. I can see how QUIC could help eliminate UDP client barriers, but those barriers pale in comparison to multicast. Multicast routing just doesn't exist on the Internet; it's only supported within some independent, typically small networks. Most ISPs don't support it. Wherever you could manage to distribute content with multicast, you'd necessarily also be resolving the collateral routing problems which QUIC support resolves, whereas even ubiquitous QUIC doesn't materially improve the multicast situation.

IIRC, QUIC was also the precursor to HTTP/3. I don't like Google's motivations for wanting a faster web, but many of the things they've encouraged and/or provided have made things faster and more efficient. I'm not a google apologist, there's so much wrong and so much harm done... just saying it's maybe worth separating the tech from the motives.