In short, it's a very active and growing activity. Many data leaks helped people to identify wealthy targets. Some just brag about having crypto.
https://www.lemonde.fr/societe/article/2026/04/24/enlevement...
https://www.franceinfo.fr/faits-divers/cryptomonnaies-la-vag...
https://www.lemonde.fr/societe/article/2025/08/19/l-ascensio... (paywall)
https://www.slate.fr/societe/enlevements-lies-cryptomonnaies...
Some random recent ones we know about:
https://france3-regions.franceinfo.fr/grand-est/haut-rhin/mu...
https://www.leparisien.fr/faits-divers/renseignes-par-des-ha...
