Sorry but this is maximum level conspiratorial thinking. Meta probably has some created some incentive for OEMs to make larger screens by way of people liking content consumption but the idea that they’d be paying for that is ridiculous lol.

I find reading ebooks and long texts like wikipedia a lot more enjoyable on my 6.8" AMOLED panel than on the smaller screens i've had before. You can also doomscroll on smaller screens.

Just today I giggled and reminisced over the old XDA Developers Nexus 7 posts about LTE and wifi calling hacks…the many few of us worked hard to only rely on a tablet! Ironically, there is now not a second of my day in which id find a folding phone useful or logistically feasible. Alas…13 years too late.