Cannot register at lootup.me due to browser hacking

On moneymaking forums, Lootup.me is a popular get paid to (GPT) website with minimum payout of $1.
Since most of the websites which were listed in 2015-2016 are not existing, the domain investor is trying to find some reliable websites
So she tried to register at Lootup.me, where the user has to specify the user name
Yet for every name that she is inputting, she is getting a message, user name is already taken
The Firefox browser is hacked to prevent her from making any money, registering at the website.