Legal and morally right are two different things though.

Laws at least have the advantage of being written down. Morals are different for everyone and not constant in time even in a single individual.

Laws aren't always written down. A good example is what happens if you criticize Israel - the government, if it notices you, will come down on you like a sack of bricks, even though there's no law that says "don't criticize Israel". https://youtu.be/zJt3omLLAuA

Likewise, there's no law saying "don't accept payment in Monero" but you may be jailed for money laundering if the government notices you.

criminals are not always bad people: https://www.youtube.com/watch?v=VrFs2_uhz-o

and to break it down lawfully or/and morally bad:

  lawfully bad, morally bad = bad and crypto is one of the major tools in your arsenal

  lawfully bad, morally good = neutral, but you are a prosecuted criminal, crypto is helpful for you but there are alternatives

  lawfully good, morally bad = bad, but not a prosecuted criminal, crypto is not that useful for you

  lawfully good, morally good = you are not a criminal, crypto is not that useful for you