It's because of the royalties that have to be paid to each and...

It's because of the royalties that have to be paid to each and every exchange that supplies the data.

The data supplier has to pay these exchanges a fair bit per month in data royalties.

Even the brokers have to pay for it.

I guess people don't mind providing something for free if it doesn't cost them anything, but they will not give away something that costs them money for commercial reasons.