They should just use the same approach big minecraft servers use, the game itself has no anticheat, but the server makes sure the data it’s getting from the client makes sense and kicks clients sending weird data. Doing any checks client side will always be insecure and a nuisance to players
Somewhere around 2017 I bought an old dell precision from 2011 for $25, put a radeon rx 570 in it a few years later and used it as my main computer until last year when I finally got around to building a replacement