Rise of lowest tier of multiplayer shooters, mobas, battle-royales etc. culminated in many franchises abandoned and for the roughly two years there was shortage in other genres on PC. For example both RPG and strategy games on PC basically completely fell of AAA category and whatever came of in those years was very subpar.

Multiplayer plague was so bad that the term “single player games” was increasingly used not as very rare blanket term, but in place of the more detailed classification, there was so little of notable single player games on PC back then so gaming mags barely even bothered.

Fortunately PC gaming recovered very much since then but it was bad time (unless you like multi shooters, but overabundance of games requiring so much time online is not good too)