Well, there is no problem if we log in using VPN and use the same PC/Browser, because the server certainly keeps a log of activities such as cookies and sessions so the server will recognize our activities even though using a different IP. Usually the account will be locked if we log in using a different IP and PC/Browser, but I don't know whether Bitsler implements security like this.
I've been using Bitsler for quite sometime now and I never encounter such problem like my account was locked for using a different IP, PC/Browser. When I visited my friend in Singapore, I logged in Bitsler and I never have such problem, same when I was sent to Thailand for a training no problem whatsoever. You will be asked to verify if its you through an email, but locking the account, no.
True, Bitsler does not lock accounts that use different IP. Bitsler will ask players to verify the login if players are using different IP address through email. It is just to make sure that the one who try to login is the real owner of the accounts. I have never even heard any sites that locks user's account just because login with different IP/Browser/Device.
@MonsterV, mind to share which sites you are referring to? Since you say "usually" means that you know some sites that implements such system which is a bit weird IMO especially if players are locked just because using different browser/pc/device.