Tangentially related, recently Google pushed an ad for chat.google.com my way (in a Gmail popup no less). It seems they made a Slack competitor, it sort of uses

Tangentially related, recently Google pushed an ad for chat.google.com my way (in a Gmail popup no less). It seems they made a Slack competitor, it sort of uses Hangouts for one-on-one chats but its own thing for groups (and groups from Hangouts don't show up there) and broke Hangouts in Gmail since then (some conversation where the other person wrote the last message shows as unread the next time I open gmail).