Currently, even with massive tracking, the ads are completely non-relevant and it's next to impossible to find a previously seen ad.
Additionally, this would automatically make other services subscription-based. Do you think a yellow pages-style directory for the Internet would be useful and successful?"
Directories have been tried over and over.
Search engines show you possible shopping items eg above organic results.
*Amazon is stealing search from Google and Meta by effectively being a better yellow pages than they, when a user almost defintely is in shopping mode.