In this case the centralized owner is the Chrome Web Store; you're leasing space in their list of offerings at their terms, for better or worse. It's worth noting that the Chrome Web Store is just an easy (and highly visible, of course) way of installing extensions but not the only one; developer mode and self-installing is totally possible (though admittedly higher friction).
Protecting users from malicious actors serves in the best interests of the Chrome Web Store, certainly, but there's nothing stopping users from running their own security software.
In a more ideal world a developer would distribute an extension from their own platform and the user would run a security check against it (and all future versions). Until we get to that world, though, a store that is focused on integrity of security and expresses its right to remove things that don't fit it's model is convenient.
Protecting users from malicious actors serves in the best interests of the Chrome Web Store, certainly, but there's nothing stopping users from running their own security software.
In a more ideal world a developer would distribute an extension from their own platform and the user would run a security check against it (and all future versions). Until we get to that world, though, a store that is focused on integrity of security and expresses its right to remove things that don't fit it's model is convenient.