Hi ee2lyntio could you be specific about what coin you are talking about?

JSECoin is completely free. Bitcoin Cash also offers a small amount for free as well. Its not a lot, but it gets people started in the currency and able to tinker with the technology and get familiar with it.

The Coinbase offer is not exactly free in the sense that you have to buy $100 or more of one of the cryptocurrencies available at Coinbase, but then they give you a free $10. This is technically free, while you do have to buy $100 in cryptocurrency, such as Bitcoin or Bitcoin Cash to get that $10, none of it goes away, you could always turn it back into USD if you wanted. But for people that want to invest a little in crypto, Coinbase makes it profitable to do so, because your $100 investment instantly gets you a 10% profit on that investment. (Coinbase fees will lessen the profit a little bit)

Hope this is helpful!