I just got a bunch of free crypto using coinbase answering questions about various coins, there is a short presentation on each then a few questions to answer, if you get it wrong you can try again. I spent about 10 minutes doing all the quizzes and ended up with about £30 in crypto. You can trade the coins to other crypto using the app if you want to, but I decided to keep them and see where they go.
So if you use coinbase and have 10 minutes free it is worth doing.
These were what I got.