Just make sure you are using the real mirror link for the website since many scammer is faking there website to phish your account credentials. You have the right decision to use mirror link instead for VPN to avoid possible trouble in the future soon since many incidents before that involves VPN.
Does France permaban Betfury or it just happened last Thursday because this might be an issue by your ISP.
Betfury has only 3 official mirror sites with easily remembered domains such as .ai, .gg, and .so. However, if a user has doubts and wants to avoid phishing, it's better to add an official page with these mirror sites in the bookmarks of the browser. As for using a VPN to access the site, Betfury doesn't prohibit it, and I don't remember a case when a user of this platform has had any unpleasant incidents because of the VPN.