Actually, declarative partial updates (HTML patching) have long been possible in every modern web browser without JS by using my Pure HTML Out-Of-Order Streaming (PHOOOS) technique based on Declarative Shadow DOM. You don't need another syntax with processing instructions. Demo: https://kraksped.pl/phooos/
For GMaps alternative, there are Here WeGo or Bing Maps. For Android, there are Sailfish OS or Ubuntu Touch. For Chrome, there are Brave or Vivaldi (Blink-based). Google is not irreplaceable.
Serious question: why do you use Google Chrome in the first place, when there are better alternatives, e.g. Brave (crypto stuff could be easily disabled) or Vivaldi, both with adblocker?
Freeloading? Bad word. There are plenty of free/open source alternatives like Discourse, Zulip, Matrix, so why would anybody pay for something which should be free to use and respect user privacy?
No, Discord/Slack is a mess. Interesting topics got buried in an IRC-style chat. Threaded BBS are much better for organizing communities, like Discourse. And it is open source, so no vendor lock-in with stupid age verification.
Llamafile (https://llamafile.ai) can easily exceed 4GB due to containing LLM weights inside. But remember, you cannot run >4GB executable files on Windows.
I doubt it’ll be radically different from other implementations of AI + Browser in such a way that it stands above the others.
Mozilla distinguishes itself by allowing to use any AI, including open source private, local LLMs in their chatbot, not only proprietary Gemini like Chrome or Copilot like Edge. This is privacy-friendly.