My philosophical beliefs around what open source should be aside, the problems caused by blockchain-related technologies like cryptocurrencies and NFTs have become too large to ignore and I feel compelled to do anything in my power to smother them out of existence.

I wish to add a legally robust "blockchain clause" to all of my projects' licenses that disallows use directly or indirectly in blockchain-related projects. If there are any that already exist, then Ideally I wouldn't need to hire a lawyer to draft one up, but I might be willing to pay if the costs aren't too high, knowing that others would then be able to use it freely.

I personally would want to see lots of widely-depended on open source projects adopt such a clause, whatever dangerous precedents that may come with it.