Answer
Yes, this is dangerous: if a person does not understand how cryptocurrency works, the risk of losing a significant part of their money is high. The problem is not only the exchange rate, but also mistakes with wallets, transfers, withdrawals, and confirming the origin of funds.
Being paid in cryptocurrency does not eliminate the need to keep records of income. You need to understand the date of receipt, value, counterparty, wallet, and subsequent route into fiat currency. Without such a chain, it becomes more difficult to explain incoming funds to the bank and link them to actual work.
Transactions through random people and unclear P2P schemes are especially risky. For a regular salary or large amounts, it is better to establish a transparent process in advance: a contract, a clear payment method, records of the amount, and careful withdrawal of funds. Otherwise, a convenient payment method becomes a financial and banking risk.