Why I think there can be no such thing as a casual 1v1 league (w/o trolling or degeneracy) is due to the nature of regiments in general when participating in 1v1s or the competitive scene.
Regiments will want to beat the others, so they will take it seriously. It then escalates on both sides until it basically reaches the salt levels and shitposts that they always result in. It can be seen in almost all of the "Unofficial" matches conducted in the community. One side always gets mad or thinks they should have done a lot better. No matter what, people will take the matches super seriously, therefore just generating another competitive league. The only difference is it claims to be a "casual" league. Another evidence point is the PUGs. PUGs were initially created just for fun and to obtain a tournament style simulation. People take that PUG shit so seriously I cannot even start. Even when random players are thrown together it gets overly competitive. Even if the PUG format was transferred into a 1v1 line battle format, it would still reap the same level of salt and competitiveness.
Literally the only time people don't take things seriously
is when they be trollin