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tokens: ACKNOWLEDGEMENTS DFT and FCZ acknowledge support from the Spanish Ministry of Economy, Industry and Competitiveness grants PGC2018-095512-B-I00, SGR2017-1383, and AYA2017- 92402-EXP. DV acknowledges support from the Spanish Ministry of Economy, Industry and Competitiveness grants AYA2016-80289-P and AYA2017-82089-ERC (AEI/FEDER, UE). FCZ is supported by a Juan de la Cierva fellowship. DFT acknowledges the participants of the Workshop on Magnetospheres of Neutron Stars and Black Holes (June 2019, Goddard Space Flight Center) for comments.