I recommend reading the Reuter's piece, this raid was about the TV fraud and the bitcoin mining was just one small part of the money laundering for that, it was only coincidentally a raid on a bitcoin farm, not as the Reg headline suggests.
Spanish Bitcoin farm raided
Spanish police have raided six Bitcoin mining centers across the country, arresting 30 people on money laundering charges. The arrests in Madrid, Barcelona, Valencia, and Cordoba followed an investigation by the country's tax agency. Reuters reports the operators were laundering cash obtained from pay TV piracy. Some €31,320 …