The other fees they rake in (I'm assuming you mean interest) are from issuing unsecured loans. That's another topic entirely.
Escrow is many thousands of years old and certainly exists in many forms in the financial system today. It's just that because of all of the other things I mentioned the average person uses it maybe a few times in their lives for very large and complicated transactions.
The suggestion to use escrow or some other kind of really convoluted system for extremely small payments when I can swipe a card anywhere in the world with all of the benefits mentioned above and more for relatively tiny fees is frankly ridiculous. Of course it makes sense for marketplaces where every single actor in the marketplace is breaking the law in the first place.
I've been involved in crypto since 2017 and I'm STILL waiting for a reasonable use case or application where it results in a net benefit for the average person.