Do HotSpots cost money to use?

I always see "T-Mobile HotSpot" signs at starbucks shops. So what did I do? I bought a wifi card for my laptop. I went to Starbucks to test it out and what do you know, the access home page (T-Mobile) directed me to a "create an account" page. I didn't know that hotspots cost money!? Is this true? I thought they were free to access. What gives?

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