Earlier quoted context omitted.
3) And how can we keep on using F-Droid and other app stores? 4) How can we install apps made by devs who won't do the verification dance with Google?
Developers who distribute Android apps on other app stores are not strictly required to undergo verification and thus can remain anonymous, but if they choose not to, then later this year (when the enforcement of verification goes active) their apps can only be installed on certified Android devices via ADB and/or the new advanced flow. Thus, you can still install unregistered apps if they're distributed via F-Droid…
Bad implementation. Like the SAVE act that requires you to bring your up to date passport just to vote. It's clearly user hostile.