>I don't know if this will affect the likes of Kickstarter though, if they don't have any physical presence in Spain I don't see how the government is going to know about it.
Well, obviously they will known when you receive your funds for your project, else you will be tax avading if you don't report it.
Obviously if you are in need of a significant crowdfunding campaign you'll probably have to relocate to a friendlier place in the EU, at least temporarily (I guess if you are looking for more than 1M euros it might be worth it).
