Calling them ewaste is a little dramatic. While sites like this are a cancer, there is free WiFi in basically every town in America. You can get data for free, even if it’s slightly inconvenient.
It was a bit dramatic, but I've seen these guys just leave these phones behind once the data is gone. They're not likely to carry it around for the next 27 days until the data is refreshed. They'll generally just hustle for $10 to bribe the phone agent to bypass the SSN check and give them another fresh phone.
The issue is that the wifi isn't available where they need it. If I send them to the SSA building to get some federal docs, it's in a dead zone. It might be in the middle of Chicago but there isn't any free wifi for a mile in any direction from there. How do they pull up Google Maps to get home? And it's not always obvious how to get the free wifi as it doesn't just let you connect, you had to go through a multi-step process of signing in and accepting T&Cs these days. Which the phone doesn't always want to do.
I think you may be a bit out of date. There was free WiFi in basically every town. Now it's frequently a vestigial, no-longer-maintained free WiFi that works like crap, because there's no maintenance, because "everyone has cellular data nowadays".