When designing your RSS feeds, the top level title should be the title of the user’s account. So if Bluesky had a feed for each user, the channel-level
<title>Bluesky: Mark Cuban</title>Why? Well because readers need context. And it’s easy.
And feeds are showing up in places where there isn’t much room for the titles, so you have to make your characters count.
Bluesky shows the user’s address, imho it should be the string the user chooses, usually simply their name.

The arrow points to Mark Cuban’s feed from Bluesky.