Premades in doom match teaming and boosting, unfair

Premades shouldn't be allowed in doom match there were people teaming and boosting for achievements.
Proof this is happening: 5056265403
soulhectate, honestas, extreamler, misstresskarma. Check their match history every single doom match is them teaming with each other how is that fair premades are allowed in solo game mod I thought premades would be banned in doom match very disappointed,