Sadly most reports just get ignored.... atleast it feels like it.
One guy who blatantly wallhacks on EU servers since release (he is level 76 right now) still isn´t banned.
Met him today again and watched + recorded him the entire match "AGAIN"..... he basicly looked at walls/hills/rocks all the time, never at any horizon and pinged enemies through it without even seeing them once (he played bangalore)... each engagement he prefired perfectly (i even watched it in 0.25 speed and you could clearly see he started firing every single time before a pixel was even visible).
He didn´t run an aimbot, though.... but the intel he had with his wallhack basicly gave him the advantage he needed to win all his fights (his aim wasn´t close to be good, but decent... yet he got 17 kills).
These type of cheaters are the most common ones and there are a lot of them in Apex..... aimbots/speedhacks luckily aren´t so common yet on EU.
So either devs or EAC devs don´t know how to spot wallhackers at all and don´t know what behavior they have to look for... or they just don´t take any reports serious since you actually can´t report anyone for "Wallhacking" or "ESP"... only for killing without sight which is something totally different.