No, it's not a scam.
No, it's not a scam.
They might not be practical for large-scale use, but they could still serve small purposes.
They're outdated, sluggish, and consume a lot of power. Even a mid-range Ryzen 3 3300X easily outperforms them.
If you manage to obtain them at a low cost, you can set up a home lab. Using second-hand hardware that fits could be worthwhile if you need it for a project. A stream encoding system might be useful, especially if you plan to run a server or explore other ideas.
If you could source parts affordably and needed a workload that really benefits from quad-channel memory even though each channel is slow (DDR3), it might be worth it. Otherwise, a first-generation Threadripper would likely suffice.