[idle_zealot]

> I can't run a spam filter on the Twitter app on my phone

That's nothing fundamentally preventing this. It's Twitter themselves who've decided not to allow you to do this. Were their app more open to extension you would be able to download and configure a spam filter of your choosing.

[joshuamorton]

Are they allowed to provide a default filter?

[coredog64]

This is it exactly: Apply the same rules that they have today for content moderation, but allow users to opt in to that filtering. Even if they apply it by default, that’s probably enough of an fig lead to get by this ruling.

[idle_zealot]

They can provide a first-party/recommended filter, but like with default browsers, search engines, or other preferences, the app should present the user with the choice in clear terms rather than silently applying the default. Defaults are powerful, so having the app apply its default first-party filter and hide away the option to change it in some menu would be approximately equivalent to changing nothing but forcing Twitter to act as a datastore/api for competing microblogging platforms.