Its always better to stay away from such people. In the crypto space I have learnt one important thing and that tells me if someone is contacting you without your consent or without your inquiry about that product and services then that is the number 1 scam mate. There is no way one can believe on such people who are making up things so easy for you. A broker in the crypto would be costly affair and scam call too. So watch out yourself from such contacts and take baby steps to learn whats going on. I would say no to you as straight decision.
Yes that is right and specially if you do not have any direct contact with the broker or you do not know him personally. I think that you should do trading directly using good and secure exchanges where you do not need for any broker.