What are your views on whether things should be paid using Bitcoin in terms of if it should have legality or illegality?

1 Bitcoin equals $10314 as of right now. The price changes based on many factors. The highest 1 Bitcoin ever equalled was $19783.06, which happened January 1st 2017.

https://en.m.wikipedia.org/wiki/History_of_bitcoin

Do you think Bitcoin is used by many people who have bad intentions since its traceability is virtually impossible? Yes, there are hacker experts out there who can trace wallets but it takes major computer skills. Many people may buy things where they don’t want their transactions traced. Can you name a few things this can apply to and why they’d want it to be a secret transaction?

Should it be legal or illegal? Please share and thoroughly explain!