You are thinking about it from the point of view of an enthusiast/hacker who wants to put their homebrew stuff on it. But this is also tightening around developers who may want to distribute their applications to lay users.
Those developers will pay $25 for identity verification and have no issues.
There are exactly two groups of people who sideload APKs:
* people who know what they're doing
* people who are being victimized
Lay users use Play Store.
Users who use F-Droid are already not as lay. If you distribute stuff that Play Store would ban, your users are likely not as lay, too.
Yes, it's inconvenient, but I see it as a good-faith attempt to limit exposure of lay users to scams, not some power grab.