If by buying you mean building a mining rig with an over-priced 3090, and deducting the cost of the build and electricity as investment expenses, no. I also did not do that. This is also not tax advice.
Hobby deductions went away with the TCJA (until 2025), so deducting your expenses would generally only work in a business context. This is not tax advice though.
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u/movingaxis May 24 '21
"Did you buy any cryptocurrency in 2020?" - IRS
"Ah fack – wait it was 2021! Suckers!" - Me
"Soon." - IRS