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All the liquidity and capital is on Bitcoin and Ethereum (~$1.5T in capital). Ethereum is in the late stages of migrating to proof-of-stake. It will happen in the next 9 months.

Smaller chains have less economic security and less integrations, so it makes sense if they are expecting large donations to use something well established that is very unlikely to suffer a reorg attack and that is easily accepted worldwide.

And as others have said, 1 nft makes no difference to block production. and for the long term energy efficient solutions are in testing now (for likely deployment in Q4): https://rayonism.io/

There are NFTs on those, but they suffer the problem that the currencies of the blockchains in question aren't very convertible from actualmoney. ETH is relatively convertible and can run NFTs, so they tend to happen there.