ehhhhhhhhhhhhhhhh not exactly true, there has been times where it's been horrible
there have been blatant rage hackers running it down in tournaments for months griefing people intentionally out of qualifying for the cash cups
which then changes who claims what drops and ruins the competitive integrity of the entire season as different people are conned in FNCS
there has been people banned for using DMA cheats that went undetected for months, won cash cups, played on alts to farm weaker regions for money etc. look at wolvax, he got caught doing this, got banned, and is now somehow back competing
retired pros have sold their accounts to known rage hackers, won FNCS and qualified for the global LAN, and only got caught because they had to send the retired guy to the LAN and he couldn't stop gossiping about it
plenty of situations where teams who are friends land near each other and trade surge, soft team etc (not really applicable to val though)
kids on NA that got swatted, parents received threats etc because they are conning a drop
however i think with the riot anticheat it's a lot more difficult to cheat on this scale and get away with it, easy anticheat was absolutely horrible for a long time