Revolut account and taxation

As per the law (your country's), you have to declare your income. Not doing that is fraud and it will carry some sort of punishment. That being said, yes, Revolut will share your info (also per the law), and they say it in their terms:

We also share your personal information with fraud-prevention agencies to check your identity, protect against fraud, keep to anti-money-laundering laws and confirm that you are eligible to use our products and services.

I guess you should create a business account in Revolut for receiving money for a job. Otherwise there is a chance Revolut will block your account and you will have to explain/prove the income.