Apparently, a few days ago FIFA filed a criminal complaint against Viagogo: https://www.fifa.com/worldcup/news/fifa-files-criminal-complaint-against-viagogo Do you think they will actually cancel tickets purchased from Viagogo?
How? Tell me, what methods can they use to find out who sold their tickets on which site? Why only Viagogo and not Stubhub? Etc etc... Half of those Viagogo tickets come from FIFA anyway.