At my first glance, all apps which belong on the lists are all legit since Coinbase is included. But better to check them one by one of course. To be honest, I haven't try any of them so far but I've already experienced such schemes before so I hope I can share something with you .

The first three apps just offer cashbacks wherein you will use their app instead of going to the actual online store. I may say that Yes! you can earn due to savings but the total amount of money you can earn still depends on how large or how frequent you buy online. Thus you will find a hard time on accumulating them. Actually, until now I am not benefited by my savings because they're few (I already forget the site as well lol). Furthermore, I've also tried answering surveys and doing different tasks for exchange of crypto before but all of them are not paying me so until now I have trust issues regarding this stuff .