In most (all, I think) US jurisdictions, providing legal advice is practice of law, and doing it without a license to do so in the state is prohibited (usually, a crime.)
This isn't not legal advice and I am not a lawyer. Consult an actual lawyer licensed in your state before deciding whether or not you should provide legal advice.
Legal advice should be limited to someone who is an attorney. There are ways around that giving of advice, you can say, "if air were in that position I would do xyz." Or "when that happened to me my attorney said I should xyz."
Practicing law without a license is a crime albeit one not often prosecuted unless you are representing yourself as an attorney and in most cases that involves the transfer of monies for those legal services but not always.
Busted!
Or, "free legal advice is worth what you paid for it."
There is a reason that lawyers online are very quick to point out that they are not opening up such a relationship.
So they give legal advice, then the person reads the advice, and acts on it. If it's wrong then they can sue.
IANAL
Claiming that you are someone you're not on the Internet is so commonplace it is hard to see where any trouble would come of it by itself. Again it's different if you knowingly cause harm to others.
I'm not a lawyer. This is not legal advice. Or maybe I am and it is. Who knows.