Why do people go offline in M+?

[Paynê-stormrage]

Actions Taken to Curb Griefing by Repeatedly Leaving Groups

Today, we issued gameplay suspensions to players who intentionally left Mythic+ groups a great many times in The War Within Season 1. The sort of behavior we actioned was either without regard for the experience of their fellow players, or in some cases, even deliberately intending to harm others’ experiences. This is detrimental to the community of players who strive to do their part in group content the vast majority of the time. We understand that occasionally, abandoning runs will happen. …

This is a threat, "Today, we suspended players who repeatedly and recklessly disrupted Mythic+ groups.

We will continue to keep an eye on groups in the future, and repeat offenders are subject to escalating penalties."