The expense of mining those materials without cheap child labor would make the cost of EVs more prohibitive than they already are. In 2020, there were an estimated 40,000 children digging cobalt in the Congo. They made between $1 to $2 dollars per day. As of 2023, the average salary for a miner in Australia is $112,960 per year, and as much as $160,000 per year for experienced workers. The fact is, the batteries for EVs rely on cheap child labor. Without that, nobody could really afford one.
In addition to that, the $1-2 dollars per day is feeding those Congolese children and their families. Those who were dependent on that money would probably starve to death.