Valve destroyed the matchmaking imba in Dota 2 with patch 7.40b

In patch 7.40b, Dota 2 developers significantly nerfed Tidehunter, who was considered OP, and his winrate literally dropped in few hours

According to data from DotaBuff

Statistics show that before the gameplay update his winrate was 59.3%, but after patch 7.40b release, performance dropped to 51,03% In just few hours the hero lost 8% winrate, although he still wins more than half of Dota 2 matches

Credits: Valve Corporation

It is worth noting that this is the biggest drop among all heroes Probably Valve reacted to players complaints that the hero could literally solo destroy the Ancient Tidehunter was heavily nerfed in Dead in the Water, as well as the Blubber Talent, which made him OP in previous patch

Also it became known that Treant Protector became the new meta in patch 7.40b thanks to buffs from Valve