RossMan...
You may be right .. or ???. (The web page mentioned above is both confusing and contradictory

.)
If you click on "Long Distance Offer Details and Terms" you'll find
NO requirement that you switch ISPs. Indeed, how could they *switch* if, on their form, they only ask for a User-Name and password?
Yet elsewhere, they mention switching "Internet Access."
As we said, tread lightly. Their form "suggests" they'll provide an "alternate" ISP (again, how could they "terminate" your existing ISP relationship given what they ask you?).