Think of all the open source libs. Generally speaking, anyone can contribute to any part of the project.

That's not to say that some people are better than others at certain parts of the codebase, but you don't want people fighting to keep old cruft in because it's on their job title (figuratively speaking).

You can organize around customers, use-cases, platforms, concerns or other things. Some might naturally map 1-1 to software components, but the software component should not be the "reason d'aitre" for a team, rather the customer experience or something else which can transcend multiple interations of the software.