This is such an overblown talking point.

If you sign a service contract with Google (which you will if you are spending any amount of serious money), then you will have a precisely defined guarantee that they will continue operating GCloud.

I doubt anyone’s service contract stipulates that Google will continue to invest heavily to keep feature parity with AWS and Azure for the next 20 years

Bingo. I’ve had to move a companies entire platform multiple times because of similar issues. I want boring on infrastructure.

AWS has a trust problem - they have no qualms about observing that your product is valuable, cloning it, and leaving their 'customer' in the dust.