I work in the NHS and regularly get the "I'm not a robot" captcha. I know what it is and why it's there when I see it, but colleagues often complain that their "Google" has a "virus".
A lot of NHS traffic goes through a few large networks like THIS [https://www.this.nhs.uk/home/] which don't have especially large IP allocations.
A lot of NHS traffic goes through a few large networks like THIS [https://www.this.nhs.uk/home/] which don't have especially large IP allocations.