Substack Notes is in a really weird place at the moment. It’s basically just a bunch of newsletter writers trying to persuade each other to subscribe to their newsletters.
It’s a bit like being in an auction house where the buyers and the sellers are all the same people.
They need some stronger incentives for the readers to come over there - but that’s down to the writers. They need to come up with value for their readers - and just endlessly pumping their newsletter is not that.