Arm cpus and flash memory chips are worth a bunch more than 0.02 and they are easy to reuse. I've desoldered a few myself for projects. I've even rescued the data on a flash chip by pulling it from the phone.
Its easy and well worth it even for me the rich westerner. I'm not sure how valuable a mixed bin of SM capacitors are, but I assure you, if they weren't making something from them, they wouldn't do it.
Their boss is making money, sure. They are getting paid something I suppose. I really have no idea whether its a sweatshop or not. But I get suspicious when people spend hours a day on activities of marginal utility.
