The way they are handling Deadlock has many parallels to Dota 2. For example: popular invite-only playtest, probably a free-to-play model with cosmetics for sale, Dota 2/Icefrog style gameplay depth and balancing.
This game has consistently had more players than most games on Steam without even being released yet. I think it is far from going the way of Artifact, and is much more likely to take a place alongside Dota 2 and CS2 as a giant multiplayer game with indefinite longevity.
Well, we can also look at their other games for this. For example, in Dota 2, everyone has a behavior score, based on reports and such. This is used for matchmaking on top of skill, and lower behavior scores result in certain restrictions (like can’t speak, can’t ping as much, can’t play ranked, can’t pause).