YSK: There is a list of volunteer computing projects where you can donate CPU/GPU time to help researchers globally with their scientific problems.
But you would contribute less than nothing with a normal pc for this. If you've got an ASIC miner that supports sha256 you're probably already mining bitcoin so why even mention it here?
'Let us disable that garbage': Call of Duty: Black Ops 6 players hate the new skins so much that some are asking to pay for them to be removed
I don't think you know what "decades" means.