Only open source it if it fucks big tech. E.g. bittorrent or an alternative browser. Or an app on your local machine as a SaaS alternative.
We are no longer talking about open source software if you distribute blobs in place of source code.
The author of the GPL code can release binary-only blobs released under something other than the GPL. Suggesting that the copyright holder cannot relicense their code how they want is absurd.
Saying the "GPL does not allow binary blobs" implies that the author is not allowed to release binary blogs, which is not true in the slightest.