We had internet before we had browsers, then the browser took over as the main method of consuming the internet. It has a lot of problems and e.g. mobile apps are trying to fill the void, but they have their own problems. Next stage is the personal assistant agent, which will be the single entry point to the internet.
If you can just take a pencil and draw a piece of furniture, press a button and get a semi-decent CAD drawing to tweak, that'd be a huge tool for carpenters and such.
I don't get it. It shows the intro paragraph of some articles in card list and that's it? Clicking the card takes you away from the feed, instead of creating e.g. some kind of a path of interest.
Tell your friend to store only an encrypted version of the message on their server and add the encryption key to the message url as a hash. Decrypt it in the browser for the reader.
Sending unencrypted text over http isn't what I'd choose for my top secret messages.