You mean like how when Apple purposefully degrades the performance of older iOS devices when a new iOS version is out (that won't run on the older hardware)?
Help me understand what you just wrote?
1) Apple purposefully degrades the performance
2) of older iOS devices
3) when a new iOS version is out
4) (that won't run on the older hardware)?
Are you claiming Apple makes the older iOS that is currently installed on your phone, work slower, when a new version of iOS is released (but not installed on your phone)? If you can prove it, I'm sure the lawyers would love to speak to you.
If you cannot prove it, I'm sure the psychiatrists would love to speak to you.