My guess is it’s probably a national cultural tradition affected by previous or existing French laws and rightsholder practices regarding different common ways of “sailing”, making DDL from filehosts through debrid services a preferred choice over e.g. p2p methods like torrents, ed2k, gnutella etc. I’m pretty sure the filehosts+torrents products combo are a newer addition to debrid services without having used them myself. No idea about what their actual situation is and has been - but I know that some torrent trackers for French content currently exist today too.

Which is French too, and will probably go the same way as RD sooner rather than later…