I think the whole Medium discoverability thing used to be a lot better in the olden days than now. Then, Medium had some sort of standards for who could join and what they could post about, and it tended to bring up decent content for people visiting. Nowadays?
Medium literally does feel like YouTube, in that unless you've got an established audience already finding readers is kind of tricky. Read the Daily Digest they have and note down how many people there are 'average joes' without a large following compared to internet 'influencers' and 'social media celebrities'.
And now they've got the paid content thing, it's only gotten even worse from there. Now it feels like the site's trying to force paid content down everyone's throat, and completely ignores the free stuff when deciding what to feature or promote. Hell, sometimes I've had them said emails almost entirely consisting of links to paid articles from publications I don't read.
It's definitely like YouTube, but it's less like the YouTube of yore and more like the YouTube of today, a wannabe broadcast TV esque network that pushes celebrities front and centre and does very little to promote lesser known creators.