What do you refer to as investment, financial right? There are many forms of investment, time, money, physical, emotional e.t.c. in one way or the other you'll be required to invest no matter how small.

If you want to take up a skill and offer your services for crypto payments, you must invest into yourself to get employable and most times it still involves financial investments to facilitate your training

If you want to engage in the forum in order to get hired by a company for signature campaigns, you must invest your time, dedication, funds to purchase data and even to engage in some forum activities like contests in the forum, you still need money, so it's not free.

Even if you'll want to join referral contests in exchanges or thereabouts, you'll still need to purchase data and reach out to your audience or even pay influencers to advertise your link on their handles, so it still has financial implication.

In conclusion, there's if NO free way to earn crypto. Put on the hard work man and stop looking for free things void of investment. You must invest in order to harvest.