This could go to the suggestion section ig, but I think thats not important at all
I think they changed it bc there are more and more ppl using alts to tell themselves or others who the murd is- or maybe theres other reasons idrk. There was a thread in suggestions and it seemed to be adopted. But it is rlly a big change since its even harder to know if someone is teaming or not, and it allowed rule breakers to continue their behavior without anyone reporting.
And yes, unless a staff's there, or it'll be impossible to catch them. Since most of the staffs (i think) are from Europe or the USA, there will be gaps and it often happens in the morning of asia... when no staffs are dealing with tons of player reports- including teamers in mm.
I couldn't give out a proper solution to this but I think there are still spaces we can discuss, there must be a way to eliminate alt stalkers