About "free" credits in Spain:
This was from France, in 2014:
andwhy67:I spent 2 years living in France and received very few offers, videos were non existant, apart from the carousel, and install the odd app on my iPad/iPhone etc for maybe 75 credits.
Don't expect any better results from Spain in 2017. Rather expect inferior numbers.
When I started in 2011, from Germany, I quickly realised that "free" credits came with an undue toll of my lifetime - I decided to invest real money for my leisure instead. 20 $/month in the beginning, 10 $ later, now even less are well appropriate.