Scam.

Yes, have a read of this:

https://steamhelp.yuanyoumao.com/en/faqs/view/70E6-991B-233B-A37B

Scam FAQ (Confidence Scams and Trade Scams)
https://steamhelp.yuanyoumao.com/en/faqs/view/70E6-991B-233B-A37B

Scam: I Have Been Reported and Will Be Banned
https://steamhelp.yuanyoumao.com/en/faqs/view/3195-9FFB-BA06-F25B

First and Only Red Flag: A random person says they reported you by accident.

You do not have to do anything if you were reported by accident. Now if you have did something against the rules, Steam will take the necessary action.

This applies anywhere on the Internet.

P.S. Steam does not contact you outside of Steam client. Usually it is by the system in place by Steam itself. Yes, you do get emails, but they are mostly automatic emails like thanks for your purchase.

引用自 KingOfStone：

someone said

Scam

I almost fell for this trick. Luckily, I thought to check this person. My trust will kill me someday

引用自 KingOfStone：

someone said they reported me and then sent me a photo of me being flagged as a scammer
they then said i could get help from steam Community :: Rudesby Assistance Reviewer
while telling me to friend him

thats a scam 101. best to report and block them