[arcticfox]

What do they do to make money once they have their users on board?

[selectodude]

They really do sell flow and use margin. There just isn't any way they're profitable doing just that.

[polack]

They could be making a good chunk of money from stock lending, like zero cost index funds are doing.

[investorgator]

Can an introducing broker participate in stock-lending programs?

[huntermeyer]

They earn interest in the uninvested funds in user accounts.

[kobeya]

They offer margin and after hours trading for a price.