They’re like that so you can tell which are replies based off the indent rather than the color alone.

Oh! That’s interesting. Thanks for clearing that up. :)

The All Feed shows you all communities from all instances. Whether you are subscribed to them or not.

The Local Feed shows you all communities from your instance. Whether you are subscribed to them or not.

The Home Feed shows you only communities you are subscribed to. This includes any communities you follow that are located in other instances.

Look up the Pegasus Project. Governments have already been doing this. Now, they’re just doing it more openly.