Time to start scouring used-PC sales to reclaim the RAM and sell it for a profit?

Have you not noticed the domain of the submitted article? Others are way, way ahead on that already.

(Including the submitter. In their comment history is "Tip: You can sell used server RAM or desktop modules through BuySellRam to recover value from old hardware." at https://news.ycombinator.com/item?id=45800881 and all of the submissions of this domain are from this user: https://news.ycombinator.com/from?site=buysellram.com )

but why wouldn't that used-PC simply increase in price due to the components becoming more expensive?

Information asymmetry

If you can find used PCs being liquidated with DDR4 RAM that is fast enough for a modern build, then you might.

Old RAM that comes out of the PCs being sold at fire sale prices isn’t really in demand though. Even slower DDR4 grades aren’t seeing much demand.

You should use OBS to screen record rather than video your computer screen with your phone