Nah. They want to be an essential service for games.
Verified users of appropriate age.
Integrated game chat.
Integrated game VoIP.
All appropriate-for-age.

Can't develop your own moderation? Just pay discord.

So many companies will pay massive sums to outsource chat/VoIP/age-verification/moderation to discord.
And discord is already the "goto" gaming community provider.

Oh, and shop stuff.
Gift (buy) a friend a cool cosmetic through discord. Already has the community connections. Just needs the reason for games to tightly integrate it (moderation, chat, VoIP, age verification).

It is absolutely a positioning move