Yes, Bet365 is safe to use. The sportsbook provides various levels of firewall and other protections and the sportsbook itself is regulated by each of the state gaming regulations Bet365 is legal in.

It tracks IP addresses in order to know if multiple accounts are being operated via the same device. However, it may be that you have a family member who shares the same IP address and also wants to have a Bet365 account. A VPN lets you do this because you can change your IP address.