Substack became popular, so it became the defacto platform for people who want attention and reader's eyeballs on their content. Same thing happened with Medium

Substack became popular, so it became the defacto platform for people who want attention and reader's eyeballs on their content. Same thing happened with Medium in late 2010s, Medium was the defacto platform for writing for a while, you'd have Medium posts rising to the top, companies hosted their blogs on Medium.