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Running a current Linux system on hppa, alpha, or m68k isn’t about avoiding e-waste but about the hack value. If enjoying the hack value is your hobby, that’s ok per se. However, in practice, this often involves demanding that other busy people participate in your hobby when they don’t enjoy it as part of their hobby or job. That’s less ok.
i386 was easier to retire, because it had been a collective thing instead of someone having been very invested in it as a hobby.
I dislike framing current Linux system on hppa, alpha, or m68k as reducing e-waste. If that was true, current Linux system on i386 (non-SSE) would be about reducing e-waste, but https://lists.debian.org/debian-release/2024/11/msg00459.html is the realistic take about that: There’s so much x86_64 hardware that’s about to go to e-waste unless someone accepts it for zero or near-zero money, that if e-waste is your concern, you should take an about-to-be-e-wasted x86_64 computer and retire the i386, hppa, alpha, or m68k hardware.