Agreed, at worst this is just vaguely icky feeling; realistically this is a nothing burger.

To exploit this kind of thing you'd either need to have access to someone's computer to change the hosts file yourself, pointing to a different IP address, or somehow gain control of Adobe's IP address and point it to a different server. For the former, if you have local root permission, you already own the machine, why bother with this slow of an option. And the latter is already such a takeover that the involvement of this hosts file change is basically irrelevant.