For what it's worth, all the famous either unlocking or remote hacking sagas (like Pegasus) have mostly been around iPhones. Which either indicates that Androids are so trivially hacked that nobody is even talking about it (sounds a bit doubtful, IMO, hopefully), or that the majority of "targets" have been using iPhones. It has certainly been the case with all the hacked journalists I remember.

Also the Android landscape is much more fragmented, so maybe a vanilla Android exploit might not work on MIUI, so hackers don't bother when it's "easier" to develop for iOS, which has the majority of juicy targets anyways?