They appear to be scrolling through a single social media feed. This operation is likely what those social media "boosting" services are doing, where they'll bring a ton of new traffic to your profile to try to goad the algorithm into sending real users your way.
There are a ton of things you can do with a keyboard natively on Android. I would imagine these use that plus a bit of software to emulate "real" movements, like the flicking down to scroll
All of my Twitter followers are thot-bots. I don't even get the good ones that have pictures of cats in their bio. Just poorly photoshopped Kim Kardashian body swaps.