Yes, it’s a dangerous combination of media/IT illiteracy/incompetence within the general public and profit-driven proprietary social media algorithms that only aim to keep people engaged for the longest time, no matter the content they are being served. And usually, the more extreme the content is, the higher the engagement, the more revenue to be made from serving ads to the users and selling their collected data. This currently leads to a rise of misinformation, anti-scientific thinking, and so on. Which just so happens to align with extreme right-wing ideologies.

AFAIK, browser choice is still limited (as usual with Apple) because every browser on iOS needs to use Apple’s WebKit engine. That means they only differ in UI.