There is still Linux and/or OpenJDK to run on intel or powerpc macs

FWIW old Macs (I have a 2014 MBP still lying around) still boot up and work, they just don't get the latest OS updates anymore.

Lighten up, friend. Oracle dropping Java support does not an e-waste make.

What e-waste would you be referring to?

Probably due to the fact that older machines won't get updates

It's still functional and will get security updates, no? No reason to throw it away?

I've got a notification stating that in the next update the device (a working scanner) will stop being supported, probably because of the lack of ARM driver.