Well pretty much all the posts I've read have said the maths not longer works out, i.e. you don't make a profit. But, it can easily look like you do.
I used a simple bot for a couple of weeks that paid me 3 times what I paid it so I thought I was making loads. Then a friend of mine showed me the maths and I was actually losing money every time so I stopped and haven't bothered again.
It can look very attractive financially but it doesn't seem to work out well for most people.
Once that was known there seemed to be a shift to the marketing argument for using them and, as I say, I'm not convinced that works either. 😁