LMAO I know Diablo Immortal was pay2win but it also places you against people who are as strong as yourself? What kind of devious circle is this. You pay hard cash to get stronger but that only results in you playing against people who have invested the same thing. Leading to you... having to pay more hard cash. Incredible.
It's probably like the typical matching engines that maintain player ratings based on win/loss record and pair you with people of similar rankings.
He presumably wanted to be able to stomp on everyone, not realizing that the game would quite correctly not pair people with him that he could stomp all over. It's based on a reasonable distribution of ability levels, he's enough of an outlier that there's nobody near him and thus no matches.
"Now, here, you see, it takes all the running you can do, to keep in the same place. If you want to get somewhere else, you must run at least twice as fast as that!" - Alice in Wonderland