So I leave for months. Come back and realize the last 3 BTC I left on CL is worth 3 grand or more :O than go to login to CL and its only a demo..
Leave only in a paper wallet/trusted online wallet if you must be absent.
That's your lesson.
The other rubbish can happen anywhere, anytime. This sort of behavior has been around for ages and has just moved to BTC. TF may run but can't hide.