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And this flaw was found by researcher working for a cloud vendor. I wouldn't be surprised if they already have some special long-term agreements.

They have workarounds. If you prevent multi-tenant from sharing their threads on the same core, that eliminates the most desirable goal of an attacker.

However it does not eliminate the vulnerability within a single tenants own threads.

You also have to think about all the web shops that are out there that are just running proxmox or a cloud reseller who reintroduces the vulnerability in their multicore VPS setup

Big clouds have the exact same incentive issue - if a customer is really paranoid, the customer can pay the cloud extra and ensure their own exclusive infra. For regular users, the clouds can mitigate a bit at scale (but not care much about this in practice, it's not as important as cheaper faster processors).