It's clear that they intentionally did not release a web application in order to maximize app installs and thus maximum control over their users (eg. scrape your contacts, push notifications, and most importantly to show you ads).
In 2023 nobody wants to install yet another app, so this is a clever strategy to optimize for app installs. Not going to work on me though. If it's just a Twitter clone only accessible to mobile users, then content quality is going to be low because nobody is typing thought provoking, in-depth analysis from their mobile phones.