It is the fate of most platforms, initially there are only early adopters that are selected, hand picked or invited, and as the platform progress there is an influx or more mainstream content producer, and the quality tends to be more average.
It used to be possible to visit medium.com and quickly find a few articles worth reading for free. Now its almost impossible to find anything on the front page without a star (paid sub required)
You could say the same for YouTube or any other "user-generated" content platform. Back in 2006 or so, YouTube was the only way to view copyrighted music videos, famous speeches, official movie clips, etc. While those still exist, the content ratio is more like 99:1 in favor of awful clickbait, "reaction" videos, obviously fake prank videos and other lowest-common denominator content. Just check the "Trending" tab and you'll see what I mean.