The politicians are free to have independentist ideology, and they can put it into their political program. But if they try to execute some pro-independence laws, they are blocked by the overuse of judiciary system in Spain and threatened (or punished).
So yes, the Catalan independentists are there for their ideas. Carme Forcadell is going to spend 10 years in jail while the rest of the table members of the parliament are being accused of disobedience [1]. Other Catalan politicians have seen reduced the accusations because they abandoned politics (Mundo or Santi Vila[2]).
> This takedown was to an app that was used to organize a blockage of a major airport. I do not agree with the takedown, but I do not think it's such a clear cut that it's 'freedom of expression'.
It's the right to protest.
[1] https://www.ccma.cat/324/el-suprem-jutjara-el-govern-puigdem... [2] https://www.lavanguardia.com/politica/20191014/47901534881/c...