they used to claim that being Swiss based protected them from warrants like this
Read the wording, they aren't complying with US warrants, they are complying with Swiss-issued warrants. US LE/Intel agencies figured out this loophole some 20 years ago.
Swiss police requested the data and handed it to the FBI.
Citation needed. They really said they were above Swiss law?
Source? We need the exact claim here, because there's a fine line between "we're in switzerland, so warrants aren't a thing!" (outright false) and "we're in switzerland, which have better privacy laws than other countries!" (debatable).