Valve released a complete engine rewrite for Dota 2 only about 12 months ago, Dota 2 Reborn. They also release major game updates regularly.
Aside from Steam, Valve (the developer) seems to be putting a lot of focus on esports right now. Many of the recent updates to Dota 2 seem to be new features and quality of life improvements for casters and spectators.
Aside from Steam, Valve (the developer) seems to be putting a lot of focus on esports right now. Many of the recent updates to Dota 2 seem to be new features and quality of life improvements for casters and spectators.