It used to be smartphones, now it is association with the Peleg Yerushalmi.

According to this report on Actualic, Rav Chaim Kanievsky has instructed adherents who were trying to sell their apartment in Bnei Braq and had received an offer from a couple associated with the Peleg to not sell to them. They followed his instructions and pulled out of the deal.

Does this mean nobody should sell apartments to Peleg-associated people? Should they live on the streets? Is it only in Bnei Braq? Maybe in a Peleg area it is ok but in a mainstream Haredi area that is not associated with the Peleg it is a problem? So many questions, but it looks like the beginning of a cherem of sorts...!