Those kinds of scheme is a waste of time, you don't have assurance that the token they will pay you will even have a value.
Try this.
https://www.coinbase.com/earntrue . if its mostly airdrops from unkown projects but for a well known companies like other user mentioned above , we can expect a pay from them with the coin that has a value of course . coinbase is also a known companies but i heard many people never recieve thier reward from thier referal campaign and im one of them . inviting is not easy and if you think that it can be cheated well no , those companies are also smart and they know how to detect if they are being cheated or not . i never cheated them but i wonder why i dont get my coins
Referral is a hard task and sometimes these developers that runs the campaign will have doubts that you have been effective with your link and might hold your reward.
Unlike in Coinbase, it's a large exchange and won't hold your rewards unless you truly violated one of their terms.
but the coinbase that I know is that there are some countries that cannot participate in the program and only a few countries can participate in the program, I have long followed the coinbase program but still haven't received an invitation to claim the free coin
Yes, I guess there are countries that are not allowed to join and I don't know the reason of Coinbase with that matter.