Sadly, that's the state of modern Commerce.
I had a similar issue with our old Samsung flat panel, but we got in just under the warranty and it was repaired by a tech at our home at no charge to us.
My 2013 iMac is well beyond any coverage, yet I still get updates... just no support for repair if something fails.
Consumer Protection is vital. You may have seen instances where comments have been made about now requirements and enforcement that some of this gear in our hobby work as advertised be put in place. Right now, regulations are largely toothless and have no enforcement.
Regardless, after the warranty expires, there is no further obligation a company has to you or their product. While an AVR should last 5-7 yrs no sweat, and we can hope for 10, truth is these are disposable in the 3-5 yr range.