I used to browse Instagram casually. Like, once is a blue moon. I would see updates from my network and spend a few mins here and there. This was probably like over year or two back. (not 100% sure)
And then a few months back I just could not take my eyes off of Instagram reels. This feature wasn't there before I think. I was just completely hooked. It was pretty interesting. I had to delete my instagram off of my phone.
They definitely are figuring out the formula to retain people's attention.
Again, this is just a data point of one.