Accounting Standards Update 2023-08 might be an important contribution to the special status of this bull cycle. It has been mentioned before, but the consequences haven't struck me until now.
With the old rules, if you had bitcoin on your balance and you bought low, you'd still look (balance wise) as poor as when you bought it. With the new rules, you appear to be as rich (balance wise) as the bitcoin price allows.
I hope this won't be a precursor of taxing the 'unrealized capital gains'.
I don't know the tax code too well, but I doubt they would (or could) do that to companies.
I don't know about other countries but... As an example, in Spain there are some investments like funds (not sure about Bitcoin specifically as I don't have any company owning Bitcoin) that companies do need to update at end of year to its "market value" and adjust profit/loses according to it no matter if the company didn't sell. Individuals are NOT required to do this unless they sell though.
So I wouldn't be that much surprised if that is already the same case of other countries nor about them adopting it in the future (because states always tend to adopt the more favorable/profitable tax rules... for them).