I guess they might also have a system that detects if the browsing pattern is unusual, i.e. someone has rooted your machine and has stolen your login cookie and

I guess they might also have a system that detects if the browsing pattern is unusual, i.e. someone has rooted your machine and has stolen your login cookie and is browsing at the same time as you on their own browser. If you break the back/forward buttons then you can find impossible browsing patterns that could indicate this. source: total conjecture, I know nothing about these apps.