Cryptomarket, or known as the cryptocurrency market are decentralized, which means these markets are not backed up by authorities such as the government.
Before adding my POV, I want to ask in simple words that did you mean crypto exchanges by cryptomarket? Because that's what I have understood after reading your post. if that's the case then, there are some crypto markets that are run by some single entity and also by the government but they charge a lot in terms of fees and tax, and they cost you privacy.
2. Knowledge is not enough.
You are right knowledge is not enough the person you are following should be practicing it as well, but if a person is only practicing and has no knowledge then you should also not follow him as well, because that's also not a good way. You have to be both, knowledgeable and expereicend.
3. It can be both passive and moderate income for you.
You are right, trading, investing, staking, and all other types of activities can make us a good amount of income.
PS: I did not get the main point of your post, please shed some light for me thanks.