To add to other commenters - its also really hard, assuming you play solo, to focus on your own performance and not blame teammates. I’ve never been toxic, and tried to focus on my own gameplay, but I eventually realized its almost impossible. Even though I thought that I don’t care about others, and even though I managed to never be toxic, it only ocurred to me when I switched to StarCraft, where you play 1v1 and there’s no-one else to blame. It was so mentally taxing, queueing for another game when you know that you just suck and will loose again to some easy build. I lasted for two months of ranked StarCraft, before I had to quit due to mental health. I just wasn’t able to play anymore and was dreading the next match.

Which is something that never happened to me in MOBAs, because even though I was sure I’m only focusing on myself, it became clear that wasn’t true - otherwise, I’d have quickly had the same problem as with 1v1 games. I managed to not be toxic because I hate toxicity and am non-confrotational in general, but if you are someone with less self-control, blaming your teammates just come so, so naturally. And accepting your own mistakes is way harder than I thought, which surprised me by how much.