After the introduction of mythic+ and the rise of ingame toxicity forum toxicity has pushed me over the edge a couple of times but I wouldn't really call it the cause.
After a couple of months of pleasant dungeon experiences in FFXIV I often returned to WoW but quickly unsubscribed again due to the toxicity and "go go go" mentality of their dungeon experience. In Shadowlands I haven't even bothered trying, I know it's a shit fest.