Ew. Good thing uBlock Origin blocks it then.
And here I was wondering if I should start Tor, as I usually do when doing anything health or politics related, but thought I was maybe being paranoid for something upvoted on HN...
UI session recording services are incredibly common across all kinds of services. Inspectlet, Glassbox are two others I am aware of, but there are no doubt more. They also probably exist for mobile apps.
It's also super creepy.