WhatsApp, which is owned by Facebook, says Podemos had been breaking the terms of service by using the channel for automated mass messages. Podemos accepted that it had been using the channel for this purpose but said other parties had been doing so as well.
https://www.independent.co.uk/news/world/europe/spain-electi...
Apparently it's reinstated but Podemos is not too hapy about being singled out.
https://www.20minutos.es/noticia/3623961/0/respuesta-whatsap...