This is more necessary with the rise of freemium games where the base account is trivially replaced and so banning people's accounts does nothing.
Not that paid games don't have cheating issues, but there's a limit on how much people are willing to spend getting rebanned regularly.
Riot Games was also the one that introduced the nanny policing of "if you deviate from the squeaky clean advertiser-friendly image we stipulate, we'll make sure you have no future in the pro scene ever again" tribunal, presenting themselves as the bastion of "pre-eliminating all toxicity from online gaming", which is ironically hypocritical considering their scandals after scandals of toxic workplace culture.
Artificially propped-up unsustainable "professionalization" whose eventual conclusion is to enforce spyware on casual participants? That's Riot's gift to the world.
LoL (Riot's first big "esport" game) didn't really start having large tournaments until 2011. LoL didn't even come out until a few years after ESL started hosting regular professionalized Counter Strike tournaments.