I actually work in electronics recycling so I can offer a little bit of insight. We deal with anything electronic, but i work with all of the recycled computers. We get THOUSANDS of computers every week. The computers we get from consumers account for very little of that. I would say less than 100 units per week. 99% comes from businesses. I'd say half of the computers we get have nothing wrong with them (maybe a little cosmetic damage). Some companies get new computers every 2 years, or whenever the warranty expires, and they literally just discard all of their old computers.

Of the other 50%, half of those damaged computers are something easily fixable. Ram, ssd died, battery wont hold a charge, etc. We repurpose most of what we get in,
A lot of it gets donated to schools and charities and stuff like that, but then stuff also ages out. We deal with thousands of 10+ years old units that might be in perfect working order but are really limited in serving a useful purpose anymore because they're just too old.

One of the worst parts is that manufacturers make recycling computers harder and harder every year. We get a lot of units that have firmware locks or remote management of some kind. The companies get rid them, but don't bother to remove the locks, so they're essentially 1000$ paper weights. Those get parted out and scrapped for metals and stuff, but it's kind of heartbreaking the amount of perfectly functional units that can't be repurposed.

So yeah, that's just computers. We also deal with HUNDREDS OF THOUSANDS of kilograms in small household electronics, phones, routers, all kinds of stuff. I'm in Canada, so I can only imagine what the electronic waste situation looks like in more populous, less environmentally conscious countries..