Yeah, it’s called map preference. A large chunk of the community does not enjoy playing Cradle of Death. I, myself, being one of them, just do not enjoy the map at all. I enjoy all of the other maps, so it makes sense to queue for Random.
Mind you, 85% of my games are with a lobbied partner, and neither of us enjoy Cradle, so your entire point is moot. On top of this, the chances of rolling Cradle on random in the map pool is about 6.7%. That’s an extremely low leaving rate, not factoring in other games where things go south, allies being AFK, or ally straight up leaving on their own. I’ve even had games where my ally has said “wanna bounce?” and we both agreed to drop the map.
So, no, Mr. “I’m holier than thou”. Having a roughly 6.7% leave rate isn’t doing the game’s queue pool much harm at all, especially so during these times where there are probably more players on than normal.