Any sane crypto miner undervolted and underclocked their GPUs for efficiency's sake; if anything, they went through less wear than, say, regular gaming.
Neat! I have A55 as well, I wish I had the time to port rockbox to it. I like Sony OS, but having the thing re-scan my library on each reboot gets old quickly
One should choose their bike components carefully. I have been able to service every single component on my mountain bike, excluding suspension since that requires knowledge and time I don’t have time to acquire (yet!). As a general rule choosing mechanical components instead of electronic ones has been rewarding on the longevity and repairability fronts. That said some components are consumable, like the dropper post cartridge you mentioned, but to arrive at the point it requires replacement you either used it a lot (I’m jealous!) or it was simply faulty :-/
Might also be a good idea looking for other bike shops in your area. Mine is always trying to recycle and repair components.