Willy, and others,
Thank you for your help. A setting on Einstein@home did the trick. Only few actually seem to have a setting pertaining to this. Anyway, my account jumped by about 160M million points in day...! Back at 217M now.
I will not further discuss the GDPR reasons behind this as I feel this is not the purpose of this thread.
But from what I see, that explains why I cannot log into WCG any more: I'm not working for them and barely ever log in, so they deleted my account altogether. The others do not seem to go such an extreme way. I'd think a better way would have been to send an email before the radical option - but then, I cannot 100% exclude I missed that.