Latest Firefox and Windows 10.
>> "Where is Mastodon today? What are its stats?"
This is the wrong question before you ask about the goals of the platform and its users. Stats only let you compare it against something it might have no interest in being.
Your dismissal of it and other open source efforts is likely due to a goal mismatch. The fact that you spent so much money on it tells me you're probably aiming at a Twitter competitor.
I don't care about Twitter and its goals. I care about what Mastodon is and what I already do with it. It's self-funding and community supported. There are plenty of people on it, and it's still growing. It seems like someone's making a new thing with ActivityPub every month that I can interact with from my Mastodon account. That's all that matters to me, and seems to be enough for most of the people on it.