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There are different problems.

Thermal cycling common to gaming uses causes mechanical failures in chips, between chips and the board, and the board - but electrolytic capacitor lifetime drops dramatically as temperature goes up.

Not much thermal cycling in desktop systems seeing mostly "productivity" use that have proper ventilation.

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Capacitors have been massively over-specced for PCs for over a decade now. This was only a potential problem ~<2010 for components like GPUs. Maybe still a problem with really cheap power supplies today, but that's not what we're talking about.

optimal running temperatures for gpus during mining is way lower than what most games will pull.

memory has to stay as cool as possible or else the overclock will be unstable.

It's still 24x7 operation vs a few hours here and there. Even a pretty hardcore daily gamer probably only clocks half a dozen hours a day if they're working a day job.

but it's the turning on and off or heating cooling under changing loads that causes the stress, not the constant running

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