This is the wrong way to look at it. We have gotten used to content and services being free, and the only way to provide that is via ads, and targetted ads in particular. It's not hard to opt out of algorithmic feeds and use search like a properly developed mind. It's not hard to block ads. Then those services are actually quite valuable and beneficial. 

I never used social media much because I just don't see how it can benefit me. What's the point of talking to strangers unless I got something to sell or buy ?

Nostr will fail at replacing regular social media but it doesn't matter. It needs to find a profitable niche for itself.

Nostr is thick client architecture, so development will be centralized around Amethyst and Damus. There is no need for more than a handful devs. Amethyst tries to add every possible feature and it makes the UI confusing and spreads dev time thin. Once again, a properly incentivized niche needs to be found and focused on. Otherwise, Nostr will join IPFS in the garden of failed projects.