I think there is no way to earn a lot of free bitcoins fast, because there is no way to earn a lot of free money fast, simply because Bitcoin is just another real currency , it's money and we need to work hardly to earn money usually
i think nope. there are many ways to get bitcoin, there are several ways that do not require capital or free. such as the signature campaign, you can get a lot bitcoin. without capital. it is very easy
Signature campaign don't give you "a lot of free bitcoins fast"
First it's not a lot , you could earn few dollars weekly usually not more
Second it's not free, you have to spend your time and effort writing constructive posts , and that's real work, so it's not bitcoins for free as OP noticed
Third it's not fast because most signature campaigns paid weekly so you have to wait a week at least to get your reward, or may be a month for some signature campaigns