Where to get donations, legally?

File: 1461467826132.jpg (113KB, 1080x1080px) Image search: [Google]

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Hello guys,
I'm not much of an internet/web type of person, so pardon me for this question
But I have no other better place to look for and get a reasonable answer (other than robotic stupid google)

I'm much better off asking this here (from my point of view)

>So my question is: Where would you guys ask for some sort of "donation" in which you get 0% taxed/fees?

I am from Spain, and would like to get this very "spotaneous job" I have "sold" without getting taxed for signing up as a self-employed or starting up a business,
(Because those 2 options are the only ways to "charge" 2k euros legally)

So I am thinking of ways that I could bypass the system, and I guess crowdfunding places could be the ones (to get the money into my bank in a legal way)

Does anybody have a better idea?
Is there any crowdfunding website in which you don't need to give approval of your "project" after receiving the amount, no fee/taxes and actually doesn't scam my lender?

Thank you so much guys
(pic unrelated, lol)