You should know in general, though, that no one trades "for free" despite what brokerages say.
Your order gets routed, delayed, placed differently, and while you may not immediately see it, your trades are getting a different result than if you explicitly paid a brokerage who charges a commission on it.
Your order gets routed, delayed, placed differently, and while you may not immediately see it, your trades are getting a different result than if you explicitly paid a brokerage who charges a commission on it.
Learn about "payment for order flow".