Synced devices

No, that is pretty much impossible

https://www.forbes.com/sites/thomasbrewster/2019/08/08/apple-confirms-1-million-reward-for-hackers-who-find-serious-iphone-vulnerabilities/#4580f49c3948

Apple are actually offering a $1m dollar reward to anyone who can do what you are describing. Don't worry about it

NO, I have never heard of that happening , at least not with an Apple product.