I don't know, do they really check who donated fiat comes from and refuse donations when it comes from, let's say, anyone involved in anything against their values ?

Checking this may be impractical. But for crypto donations, you don't need to check - you _know_ that it was generated in an environmentally-unfriendly way (at least for the currencies currently accepted).

Since cross chain activity is made available that's not true, I could do 100% of my money on avalanche or solana and bridge some only to donate

Aren't you just moving the work to someone else, who had to mine a Bitcoin block for your donation transaction to go through?

eth is moving to proof of stake imminently

If I was waiting on a bus that was supposed to arrive “imminently” for this long I’d be well pissed off.

https://www.coindesk.com/tech/2020/05/11/vitalik-buterin-say...

I got sick of hearing this claim years ago. At this point, it's tantamount to gaslighting.

Yes? As long as "without too much fuss" holds - I don't see why not.

Then why not just accept serious stablecoins ? No speculations over it, just a virtual dollar, energy efficient allowing freedom and privacy to a lot ?

So military surplus? Brown coal? These are things with functioning markets. Should wikipedia be obligated to accept my donation of them?