There is a solution, but no one wants to hear it. Anonymity is the problem and the only way to curb cheats like these are to have extreme meatspace penalties and some sort of central ID mechanism that requires some sort of real and personal identification
You mean a system where when you get misidentified (this will almost always happen at scale) you get effectively banned forever, across multiple games? Yeah... I think I know why people aren't keen on that.
(And yeah, I'm ignoring the general issue of how you id people, how you secure that data, what happens in a highly toxic game environment when someone breaches that, etc.)
People still behave terribly on platforms which require real ID's, like Facebook. Also, requiring real ID's have much larger drawbacks than you think: <https://geekfeminism.fandom.com/wiki/Who_is_harmed_by_a_%22R...>
That is not a solution because it blindly solves one problem in isolation while creating a whole host of other problems that are equally if not more destructive.
It is improper to say this is a solution when you swap out the problems for something worse as a surrogate at the same time.
When you are tied to one physical ID, you give disproportionate power to the game manufacturer, which enables them to monopolize, and engage in coercive, and corrupt behavior more readily.
Say they decide after the fact that they don't like your objective review of a game you bought because shocker it was "unfinished". They decide to ban you, that ban alerts all other manufacturers, and they block you as well. Or someone who can issue those bans decides to blackmail or extort you.
If you don't comply, in the process, they revoke access to all your licensed purchases. It is tied to a real ID, so there's no way around it. You've just been cancelled from games/entertainment as a whole.
If this touches on physical aspects like interfering with your ability to get food, hold a job, etc, you've just been forced into the dregs of society with no due process outside a rule of law. "There are plenty of people that haven't had this scarlet letter attached, ... we'll just choose anyone but them", is how it will go.
This is not a new concept, in fact it is one of the common elements found in Maoism and collectivism in general.
So the solution you propose is communism by another name. Any educated person knows Communism fails in common ways intractably, and as a result this cannot be a solution.
A good rule of thumb is, if it involves a centralized hierarchy structure; its more likely than not going to be some form of communism/socialism (fabian/globalist/its gradual neighbor)/or collectivism, and one must consider slippery slopes where once you adopt one thing, you slip all the way down to another.
Ludwig von Mises wrote a book back in the 1930s-1950s covering all of the intractable failures, under the title "Socialism". The detailed problems he describes are intractable, and naturally occur in such systems.
Communism and its derivatives are all about obscuring its origins deceitfully to trick you into thinking and agreeing its a solution. They don't give you the whole picture and they strive to mislead towards pipe dreams which never happen in practice, towards control you can't take back.
Those people will next use their mother's ID, their grandparents' IDs, and so on. Then move on to stolen IDs. Which is not preventable unless you do full-on hardware attestation tied to real ID, which means China-level surveillance.
Source: Living in a country where gaming accounts are already tied to real identities :)