Apple has a pretty good trade-in program. If you have an Apple card, it's even better (e.g. the trade-in value is deducted immediately, zero interest, etc.).

Could you get more money by selling it? Sure. But it's hard to be the convenience. They ship you a box. You seal up the old device and drop it off at UPS.

I also build my desktop computers with a mix of Windows and Linux. But those are upgraded over the years, not regularly.