Insert into Subject Values ("Tin Man" joke)

Curious if this was due to my machine or the site flagging me.

I've noticed that I get prompted and asked if I'm a robot every time recently. 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. . .