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It doesn't exactly work that easily. Beyond immediate family (spouse and minor children) - it can take years to get a visa for other family members, so the impression you are giving that they bring in dozens and hundreds of remote relatives as soon as they get their green card is false.
If there are a million of them and they each average one person and those people invite a person, it adds up pretty fast.
If it takes 20 years to bring in someone beyond immediate family (spouse and minor children) - that's not adding anything up very fast.
Yes for the rest of us but not DACA children.
They can sponsor parents and relative's after 2years if DACA passes the way it is.