Why shouldn't people use Medium? I'm probably out of the loop.
The nags, the dark patterns, the horrific UI, the soft paywalls, and the tracking, to name a few reasons
They often require log in to see the whole article. Later they cap your access to articles to N per some period of time. The only way around that is to purchase a subscription. Given the weak offering of Medium, it’s seldom worth the $/month cost of a subscription for the few jewels that might appear.
fr tho, I'm as tired of medium as anyone and am happy to encourage people publish elsewhere. Basically anywhere else, actually.