Some commentators are pointing out, not implausibly imho, that the Spanish government is pushing the terrorism accusation against the pro-secession movement as a way to tap into terrorism-related extradition agreements in Europe. Right now there are a few Catalonian political exiles in Belgium and other countries.

By the way, Tsunami Democràtic explicitly rejects violent action: https://tsunamidemocratic.github.io/noviolencia.html