Good idea, but...
Initially, I was of the opinion - classic Big Tech being AHs and only caring about THEIR bottom line. Then this scenario played out ion my head.
Me Jim Brown. I hate John Smith. I hate John Smith to the point that I want to destroy his life. Me and John are not a Good Thing.
I impersonate John. I claim my (his) mobile has been stolen. I report it to the police who don't get too deep into checking my ID in the UK when reporting such a mundane theft. I make sure they record 'my' (his) IMEI.
Big Tech bricks his phone. His life in in the Cloud. He loses access to all his contacts, reminders, meetings etc. He has been right royally, er, mucked about with... He now has the joy of rebuilding everything.
Mark up a victory for Jim Brown (me) against my enemy, John Smith.
Worth remembering, the IMEI isn't confidential. It isn't treated like a password (although it really should be). It appears in open text on email, screen, paperwork coming with delivery of a new phone...
Okay, maybe a Jim/John battle isn't that realistic. What about Jim Brown wanting to 'get even' with his ex-wife/girlfriend and having such info? Ask a close friend or new wife/girlfriend to play the role of ex and report stolen phone/IMEI...
Such domestic unrest exists. Some of it ends up in the news as reported murders etc. Malicious false reporting of a 'stolen' (or lost) phone is easier and less problematic if uncovered (eventually).
"I was told her phone had gone missing/was stolen. I'm still secretly in love with her and all I wanted to do was help her because I had the all-important details (IMEI)."
Maybe Big Tech hasn't raised the matter of treating the IMEI the same way as a password, precisely because if it were, then there would be one less objection to bricking stolen/lost devices?