I have also been on Medium since 2018, and I also have long been concerned by its lack of transparency and failure to reward serious content. I said as much three years ago.

https://medium.com/@dgilesphilosopher/can-medium-avoid-becoming-just-another-website-eb7ef855d068

We agree on much, but I don't see this leftist bias you claim. Medium's bias favors tech and business and a libertarian (right wing) political mindset.

Regardless, we should put other differences aside and together call on Medium to be more transparent and more open to the needs and opinions of writers.