It's a bit of a selection bias there. R&D dollars have been poured into EVs over the last 10 years while R&D for ICEs has been drastically cut. I don't remember exactly when it was, but somewhere about 5 or 6 years ago, several automakers including VW and MB came out and said they were no longer developing new engine platforms and were just going to let their current (at the time) engines live out their useful production cycle with minor refinements. Now, I'm sure that policy has changed since then, but it shows where the development dollars were flowing at the time. Additionally, EVs also had the most room for improvement, and selecting 2 years is cherry picking at its worst. Those 2 years ALSO happen to be the switch over from 2nd gen EVs on primarily gas platforms to 3rd gen EVs on dedicated EV platforms. The 4th gen is just starting now with the Stellantis and MB platforms that can easily do both. Walmart is motivated solely by profit and Amazon has already proven that delivery vans with 150 mile range are a perfect use case for home delivery. They aren't providing chargers out of benevolence, they are building charging stations, paid for in large part by state and federal rebate checks, for the primary purpose of powering their home delivery fleet. Amazon may have led the field with mass deployment of EV delivery vans, but Walmart is going a step further in getting tax dollars to build out their infrastructure. I'm sure if it wasn't a requirement of the tax rebates, Walmart would rather you didn't use their chargers at all.
