I expect they mean the site google.com, because that’s been my experience. Whenever I get captcha’d there for using a VPN (which is getting more and more common), I always see the Maps image style captcha. Like 60% of the time it tells me I’m wrong anyway and I just give up.

They do indeed

Correct, Backblaze is their own host and post on their blog often about their tech and processes. They’ve got a lot of good info on how they designed their server storage racks and stats on drive failures by brand etc