It's only an ads thing. Facebook, Google, etc., all require to those pages be on a website to run ads. They say nothing about Personal websites, but the EU probably does once you start using GA.

My Facebook ad campaigns were repeatedly rejected until I made that one change. And they never said why it was being rejected. It was only that change that fixed it.

Unlikely to be a source but a good benchmark is to have this stuff in place because a)It takes almost no effort, b)You don't know if it makes a difference or not, and c)There is pretty much zero chance it's going to have a negative impact.

Definitely need a source.

I had a new website that had minimal text content. At first the most popular Google keywords were from privacy and terms! Had to change those pages to no robot.

Also intrigued as to whether this could be a cause. I'm certainly not opposed to adding one, but I'd be surprised if it was necessary. But I'm here to learn!