No I find it unfair that many celebrity climate advocates preach limited consumption while consuming vast amounts of energy, carbon, etc. themselves.

Unfair in what way? If you wanted, you could preach limited consumption to everyone who listens and behave in the complete opposite manner of what you preach (to the greatest degree that your personal finances allow). Is it simply a matter of degree to you? Or is it a 'principle' thing? If the latter, there's plenty of hypocrisy to be found in the world - why focus on the billionaire who just pledged $10B to a cause that will benefit us all? Aren't there also wealthy people who preach limited consumption and don't make large private donations? At least Bezos is putting his money where his mouth is.

I've never seen Bezos push for personal austerity, have you? He's trying to move their fleets to EVs and transition data centers to renewable energy, those aren't a limited consumption measure.

A celebrity advocate who pays millions in offsets probably thinks it is unfair when comparing themselves to other celebrities who do not.