Generally no.
A few larger companies do.

I did not. I didn’t have an iPhone to be able to get onto the settings with.

That’s the most iOS looking app I’ve ever seen on Android. Not a fan. Sorry

Lets try it this way. Would say your favourites things, include everything you like? Do you like some things that aren’t your favorite? Do you keep a list of everything you’ve ever liked? Would it be as big as the list of your favorite things?

Do you see the difference? It’s a mater of degree that separates them. They are not the same. That’s why they are two different words.

You are in a way. Just not only that.

Favourite and Bookmark are absolutely different things. They’re two different lists for you to use as you see fit.
Neither of them is a Like though. I’m not sure that fact is really debatable.

Mastodon doesn’t have Likes at all.

The star you’re referring to is Favorite. Those go into your Favorite list. So you can refer back to them more easily.

A unified API and a single login, are two separate things.

A single federated authentication could be a good idea. But the various federated services are different enough that they should have different APIs.

when I first log into Lemmy or Kbin, despite me having my settings set to show me only subscribed stuff by default, it totally ignores that setting (and what communities I’ve blocked) and just shows me the equivalent of /all

That sounds like a problem with the browser your using. Try clearing cache, going back to default settings. See if it happens in a private window, or different browser altogether.

Convincing people to leave Facebook Messenger isn’t that hard. Just let them know Zukerberg and everyone at Facebook can see everything they send.

It is easier with a whole group of friends. If none of your friends known each other, you should work on that for other reasons. Groups of friends are better in general.

This always struck me as strange thinking.
Are most people really unable to understand and use different messengers with different contexts and groups?

Honestly I use a few myself. My job has Tiger Connect. I use Signal with all my family and friends. Then I use SMS for some companies automatic notifications. It’s pretty simple and easy.

So it’s about profiting off the lack of privacy. Not the lack of privacy itself. Now I get it.

Lemmy and Mastadon aren’t at all private, by any measure. Not sure what exactly you mean now.

CompuVerse.uk

Not sure where your getting broadcast aspirations from.

Nebula was created by a bunch of youtubers. Mostly the video essay types. They didn’t like that videos got demonotized so easily if they mearly mentioned a controversy. So they created their own system that’s subscription funded so they don’t have to worry about advertisers.