You get a public page at your own address, with your banner, your services and your prices. That link is the one thing to put in your Instagram bio.
What makes it work is unglamorous: a real photo rather than a placeholder, prices that are actually current, and service names a stranger understands. "Silk press" converts; "The Signature Experience" does not, because nobody searches for it.
You can switch off the public directory listing and still use the page. The two are separate — your page keeps working either way.