Why would a hosting company be able to help you fix UE4? I understand you’re frustrated, but you need to focus on what’s wrong and fix it or wait for Epic to fix it.
UE4 clearly catches the overflow so it shouldn’t be a huge problem to find the culprit. You confusing this with a DDoS attack (and speculating on free games vs paid ones) doesn’t help. Realize what it is and try to fix it. Or rest assured someone else will before you release your game; there are a lot of talented programmers in this community and someone will eventually fix it if Epic doesn’t. I know I will if it’s not fixed by the time I release anything to the public.