Thing is most of the shitcoins you could claim for free would have close to zero value the moment you're able to sell them. Heck, maybe the fees would be even more expensive than the amount you'd get. It's free, hence you'd see WAY more people claiming it. Even bots! Sure you can try to do that with a LOT of shitcoins, but god knows how many you'd do before you can even earn maybe a dollar (since I reckon most of these would sell for less than one every time).

And even if it was worth it, again, it being worth of time is pretty subjective. And I reckon spending hours to earn a few dollars don't seem appealing to most people who can spend it on better things.