One of his accounts is spying on you. KOMPOSTOWNIK.
I watched him for three hours last night. He must have a bot that can travel the world in seconds, buying streets owned by someone else up for a trade (he can't seem to steal streets that are statically owned). I watched him buy streets in Germany, US, Australia, etc. within seconds of each other that already had buildings on them, then literally a second later sell them. He's essentially stealing other people's streets and selling them to pocket the cash. He them splits up the dividends between his other, two accounts. It's not humanly possible to do what he does and as efficiently.
He keeps the bigger streets that either retail for $12M+ or in equity are worth $2B+. He swiped my US32 which was pulling in $1B+ a day in rent (that's how I found him), let it collect rent, then sold it.
The weird thing is, this bot also erases his trail. I would watch him on the "friends log" as he bought/sold, then watch a minute later as the entries were removed completely. He's cleaning up after himself. The ones he does keep get pawned off to one of his other accounts, which they too leave no trail.