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You mean Bitcoin Miners?

I experimented a bit investing in some Genesis Mining contracts back in early 2017. Got my money back, but would have been so much better off just buying crypto outright. PoW mining is really only for the specialised infrastructure players these days IMHO.

No not Bitcoin miners sadly, the actual miners that have performed badly these past 5/6 years. I think I just picked the duffers 😩

I would consider 'money back' as a good result at this point!

I know what you mean. I've got a couple of those in the bottom drawer too. Expensive lessons learnt the hard way....but learnt none-the-less.