I strongly doubt that she's an escort. First a foremost, I don't think Mati has ever had the option to notify fans of when they're in the top 1-5 % of subscribers enabled. This means we don't really have a benchmark on how much you'd need to spend to be a top fan of hers. I've had months where I spent $500+ without getting any notifications, and I'm inclined to believe that that would put you in the top 5 % at least. Mati also isn't comparable to the girls she hangs out with, because they just aren't nearly as popular.
Second, I think she makes far more on OF than what would ever make her consider escorting. I mean, a fairly unknown girl with 600-700 subscribers can easily rake in $20-30K a month on OF, and I've seen screenshots of girls making $80k a month even though they only get around 100-200 likes on their posts. Granted, these girls do not have free subscriptions, but considering that Mati likely has 10K+ subscribers (based on likes), I would say that she makes more than enough on PPVs only.
Let's assume she has 10K subscribers. If 1 % of them (100 people) buy every single piece of content from her, they have likely averaged $200 per month. In itself, that is already $20K per month, and I think that both 1 % and $200 would be a low estimation. And here, we have not even factored in that some people will be paying her subscription fee every month, and that there are likely hundreds of people who buy the occasional PPV every month. Nor have we factored in that Mati did OF "normally" for about one and a half years, with a subscription fee and plenty of expensive PPVs. All in all, I would definitely guess that she has become a multi-millionaire on OF.
Finally, Mati doesn't have an escort aura to me. I mean, she barely seems comfortable showing her tits for the camera, so I don't see how she would be comfortable showing up to some random guy's hotel room to fuck. She doesn't seem to like sex, so I question whether she would choose to make her living having it.