The change was made at the request of operators when GSOS 1 was run. It was to allow ALL casinos to comp their VIP players with a free entry. In order to make this work, MGS had to break the "one unique ID per player over all MGS casinos" rule that had initially been implemented and enforced through the software.
For MGS wide tournaments, it is possible to have as many entries as there are MGS skins running MPV. A mere 5 entries is conservative under these circumstances. The "bot" is the autoplay feature. It plays at the same speed for almost everyone, so players using it will appear to be playing in unison when viewing the scores. There is considerable advantage to be had when playing multiple free entries, but this advantage disappears when it comes to buying the continues, which is needed to place in the prizes. Hence, few, if any, of these blocks of players make it that far.
The best strategy for playing multiple entries is to select the best couple at the end of the free round, and ONLY purchase continues on these. This avoids the need to rebuy multiple times on an individual casino account in order to make a best starting score selection.
Although this "free for all" was supposed to be a temporary measure for GSOS 1, it was never reversed, and this strategy has been fully within the rules of MPV since, which is why MGS and casinos are "doing nothing about it".
It's a level playing field in that this strategy is open to anyone who wants to join in. Perhaps if too many people join in because MGS are allowing it, the result WILL cause a problem that might force MGS to rethink this relaxation of the rules, and maybe go back to the single MPV ID per person rule they started out with.
The rule is certainly unpopular with recreational MPV players who don't want to have to "game the system" just to stand an even chance against the "pros".
It is just as unpopular as the "999 continues" rule, where the deep pocketed players can bulldoze their way into the top placings, and those without 4 figure deposits needn't bother as they don't stand a chance even if they hit a jackpot in free spins.