I've noticed that I get prompted and asked if I'm a robot every time recently. I'm curious if this was due to my machine or the site flagging me. And this has been on multiple machines, on different networks with different ISPs (AFAIK).

I guess the only correlation I can figure out so far is I've used Chrome on all these machines.

I know I can't ask how the feature is implemented because that defeats the whole purpose of the feature, but what might be causing me to get it so frequently?