Because had a win streak

I believe one factor is also that there still are players who aren't playing the objective. I've had players on my team who literally ran past zones without capping and just trying to get kills.

Nah it's literally the game forcing a loss on you. Go check my tracker and look at the mercy game last night. My team had mainly 0.8s and the other team had 1.4s and a 1.7. You see the stats of players on both teams and go "oh ya that'd be a mercy for sure". It's incredibly frustrating because it doesn't benefit anyone to force a 50% winrate. Like, mercies shouldnt happen with sbmm. It makes no sense. We're supposed to be of equal skill so how are there so many mercy games still? Why are they manipulating the lobby balancing still?

I've personally not experienced much of that so I can't really comment. I've mainly been seeing players afk or just focusing on kills on my teams and those were matches i kept losing.

This happens in clash/control and has been a thing for a few years now. Sbmm changes nothing because they still lobby balance the living F out of you to force a 50% winrate.