Medium was always a hobby for Ev, it seemed. You guys were in the same building as me for a few years (760 market). I think we may have even subletted from you at one point. But even back then it seemed like you had too many people. You can't get rid of substack, but you can differentiate. I'd suggest going all in on a decentralized platform. It's clear mastodon and others currently on the market will never cross the chasm. You have the network effect to do so while at the same time offering something different.