There is a lot ways that you can earn crypto without investing you can join bounty campaigns like social media campaigns like, Facebook, Twitter, Telegram, Reddit. You can also join or participate in signature campaigns and video blog campaign if it is required in that ICO bounty camapigns. There is also called Airdrops where you can join and earn some tokens if you complete all their task and you can get rewards when it's done.
Why do people always think investing is just about putting money in? Joining all these bounty campaigns are a huge investment on its own. Not to mention the time and the electricity wasted. Spending 8 hours a day on a normal job at least can get me maybe $8 or $9 dollars a day which I can use to eat and drink and pay rent.
Tell me which bounty you can Tweet and FB for 8 hours a day and earn that much? Not many.