mastodon.online is one of the many independent Mastodon servers you can use to participate in the fediverse.
A newer server operated by the Mastodon gGmbH non-profit

Server stats:

11K
active users

Mastodon is financed by crowdfunding instead of venture capital not because we don't know that venture capital exists, not because we don't have bills to pay, and not because venture capital isn't willing to give money to new social media platforms. VCs don't want a sustainable business, they want a big exit. Every VC-backed business is on a timer to deliver or die.