Group chats are basically the Circles that Google+ saw the need for but could never get fully set up. A lot of people don’t want to share personal updates and photos to a broad swath of friends and acquaintances.
Meanwhile Instagram and Facebook keep evolving. Facebook is turning into a weird Reddit for older people. Instagram is turning into a hipper LinkedIn, where artists, musicians, and local businesses share career and business updates and advertise their wares.
Too bad because other topics like woodworking and mountain biking we're interesting and less... provocative, but that's not good for Instagram.
I have found out that the algorithm will adjust itself relatively quickly if you don't click on stuff (at some point it decided I was into foot fetish and it disappeared quickly). With that I get stuff about philosophy, math (memes), science and technology stuff with a lot of animals videos.