(Netflix as an example)

And cable companies, and magazines. This is not something from the 2020s, it is a centuries old thing.

But these are entertainment. For all the time advertising has been present, work tools have been relatively immune. I don't remember seeing ads in IDE for instance, and while magazines had ads, technical documents didn't. I have never seen electronic components datasheets pitching for measuring equipment and soldering irons for instance.

That's why I don't expect Anthropic to go with ads it they follow the path they seem to have taken, like coding agents. People using these tools are likely to react very badly to ads, if there is some space to put ads in the first place, and these are also the kind of people who can spend $100/month on a subscription, way more than what ads will get you.