I made an account many years ago and spent a few hours creating my profile which is really all I did. I didn't tell anyone about it, I didn't do anything public

I made an account many years ago and spent a few hours creating my profile which is really all I did. I didn't tell anyone about it, I didn't do anything public like following or posting, I didn't look anyone up while being logged in, I simply filled it with CV info and that's it. I don't recall if that's a thing or false memory but I think I had even kept my profile private at that point because it wasn't finished. The next day I logged in from my workplace and once I got home I noticed I had been locked out because of "suspicious logins" and that I "shared my credentials with others which isn't allowed". I don't remember how I contacted them but I believe there was a support form which didn't require login - so I did and explained the situation, that my account wasn't even 48h old, that I had logged in exactly twice from only two different ISPs from the same country and that I obviously hadn't shared my credentials with a third party (why would I?!) and that this was silly and ridiculous and that I asked my account to be unlocked. Didn't take long to get a reply which didn't state anything else but that I would require to send them a copy of my ID (passport) via mail. Noped the fuck out of that and never looked back. I can't but think the whole website is a scam.