Across all instances

Yes its so you can use any mastodon account

Mammoth has a For You tab and I found it quite useful

Looks like someone created a pull request (a code submit) for iOS client last month then conversation stopped

Is there a real life issue that people faced or this is all theories? I haven’t seen any sites blocking me yet with ads blocker used?

Can someone give me an easy to understand example of what they are proposing? Assume that I don’t allow them to install any software/tool that helps them track me/my device.

I saw this comment and found it helpful but its still not clear to me

At its core, it establishes software components called “attesters” that decide whether your device and/or browser is “trustworthy” enough - as defined by the website you are trying to visit. Websites can enforce which “attesters” users must accept, simply by denying everybody access who refuses to bow down to this regime; or who uses attesters that are deemed “inappropriate”; or who is on a platform that does not provide any attesters the website finds “acceptable”.

In short: it is specifically designed to destroy the open web by denying you the right to use whatever browser you want to use, on whatever operating system. It is next-level “DRM”, introduced by affiliates of a company that already has monopolized the browser market. And the creators of this “proposal” absolutely know what they are attempting here.