know nobody who hears an artist on a streaming service and then does anything past listen to them on said streaming service
Please allow me to introduce myself lol.
I go to live shows pretty frequently, maybe every two months or so, and my first exposure to many of the artists I've seen came from a random Spotify recommendation. I don't think this kind of thing is particularly uncommon among people who go to shows frequently. If I don't learn about them from Spotify, I heard about them from a friend or online community that was listening to them. Music really moves through social networks, so exposure can have some real value, though I agree it's rather cruel to literally not pay an artist and simply tell them they're getting exposure.
But hey, if exposure truly was worthless, advertising wouldn't be a multi-billion dollar industry.