Facebook has a history of vanishing things, so people are getting worried about archiving all the Mapillary data. Doing it in a non-cooperative manner may increase costs for everyone involved. https://www.archiveteam.org/index.php?title=Mapillary

It would be great if Mapillary entered an agreement with an open archive (https://www.re3data.org/ ) to host a dump of all the images, under a free license. I would suggest https://zenodo.org/ because CERN certainly has sufficient technical resources and has such (smaller scale) agreements with other entities to share costs of their hosting and development.