We may not be the biggest by numbers yet, but Mastodon (and the fediverse) has proven itself to be an effective and reliable communications platform over the course of the last 8 years, and does not depend on venture capital to survive. The #fediverse is the future.
I spent 25% of my life working on Mastodon. It's kind of wild when you think about it. When I started, Google+ was still around. We're doing what one of the most resourceful companies in the world couldn't do. It's not easy. It's always easier to just build A Website, then slap some ads on it. But the fediverse is the long game.