"Removed from Sale" without any explanation

You and Apple have an advantage when it comes to an attempt at an answer to that question - you both know about those two apps. Maybe if you shared some details, someone could venture more than just a guess (closer to an opinion, at least).

There are many reasons such a thing could happen. You should receive an email about it in any case.

Check your spam folders.

Double (actually triple) checked. No messages from Apple whatsoever.

I finally figured that out by trying to submit new version of the same app.

iTunes Connect said app is currently involved in an App Store Notices dispute.

Still strange Apple did not notify me about it

this is what happened to me. No explanation whatsoever. I only found about 3 days later after being approved for sale yet found that IAP still doesn't work and shows "Developer Removed from Sale" in app store connect. 2 trillion company and can't bother notify developers