Yes, they are a complete scam and looking at how bad your complete P2W, poorly optimized game is I'm sure that I have a better idea than you.
Why would some random company have a better idea about networking than my ISP?
A proxy might help you reduce ping in some cases, but for the majority of the world, that's not the case for over a decade now.
If you are paying them, you are being conned.
There are other ways to reduce your players ping, but I'm not going to go over them, why don't you pay someone to teach you?