REPEAT
We have suspended your AdSense account due to our ML system flagging you for fraud (yes, we trust it) and we can't tell you why (no, we really can't tell you even if we wanted to).
UNTIL customer goes away or the case gets enough upvotes on HN to be a PR problem
Amazon:
REPEAT
We have removed your seller privileges due to a change in our policies we didn't communicate to anyone and you likely selling a brand that was recently put on a gated list or our ML system is thinking you are a fraud because you logged in in private mode.
UNTIL customer goes away or hires a consulting company with ties to Amazon managers
Apple:
REPEAT
We have placed your account under review with opaque "policy violation" but we won't tell you why (like Google we can't tell as some of our ML models have good day flagging you for reasons known only to them). Or you might have tweeted something 5 years ago against a company we just acquired. Well, bad luck.
UNTIL developer goes away
FAANG customer service in a nutshell.