Anyone who bought Bitcoin before 2017 could probably have sold 10% recently to reduce their net exposure to zero.
After this the % of portfolio it represents is a little less of a problem, stress-wise - and it's merely a defensive move to diversify and /or lock in profits made.
Yup, besides that a lot of fellas here made even more Bitcoin by trading alts, so we are all good.
Indeed, I am guilty of alt trading, too. I guess I was lucky in those I picked, but it made far more for me than Bitcoin itself did trading alts, although the profit was cashed out into BTC as well as fiat. I still have far more in USD value terms in alts than in
actual BTC in my crypto assets, but it's purely because alts are more volatile and ultimately simple to convert into the one coin that rules them all.