I don't know about Spain but here it is essentially a need for people in charge of the "digital economy" to somehow feel useful and show that they are "regulating" something. In this case they must feel more justified because it circumvents traditional actors (i.e. banks) and involves money.
It is kind of amusing because this is a sector where most EU countries enjoyed a more liberal regulatory context before startups started to spawn in the US. And now that there is a boom, regulations are added to prevent it from developing, effectively removing any possible european competition to US companies in the space.
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.