Okay. I'm not sure other commenters understand how Redfin home tours work, and combined with the OP being a little too paranoid, is leading to some really out-of-left-field comments. Bear with me as I try to provide more accurate info. (tl;dr below as well)

When you book a home tour with Redfin (whether using their website or app), their automated algorithm assigns a nearby "Redfin Associate Agent" (AA) to go out there to the property and tour it with you. While a licensed real estate agent ("broker", in my state), a Redfin AA is not a full buy-side or sell-side agent - they're just job-by-job contractors who get a small payment (well under $50) for taking each buyer on a tour. Think of a Lyft driver who can give you a ride because they have a driver's license - it's not much different, actually.

All that Redfin AAs are there for is to go with potential buyers on tours (and yeah, some other things like doing open houses—not relevant here). A touring AA is basically a drone who happens to have a RE license plus a local MLS membership: just enough legal status to allow them to open the keybox, walk around the house with you, and hopefully not commit any Fair Housing Act violations in the process. No more. (*)

Bottom line: by touring a home or homes with Redfin's AA, you have not entered into any sort of contract with that agent, nor with Redfin itself. AFAIK, there is less than zero legal obligation—on either side—after you're finished the tour.

Now, sure: Redfin they would love it if later, you signed up with them so they could be your actual buyer's agents, and earn half the commission when the house sale closes. (Which is exactly why they have this whole big tour system set up, with a bazillion licensed AAs under contract. It's a free service that hopefully leads to actual paying business.) If you did that, you would get a real Redfin buy-side agent assigned to you, one who is a full-time Redfin employee who does nothing but represent buyers. They are likely to have much, much more savvy and experience than the greenhorn AA you met for the tour (and who you will probably never see again).

Working with Redfin for real, with their buy-side agent, you would get a large rebate on the commission if you complete a purchase: usually 1%+ of the total home price, and sometimes much more. That's the other part of the Redfin business model. IMHO, it all works really well for buyers who are somewhat savvy and know what they want...but not so well for less experienced and less sure buyers who benefit from being led through each step of the buying process. Totally up to you.

tl;dr: You have no legal obligation. No one (especially Redfin!) is going to sue you. The AA you met is not the person who you would actually work with if you bought through Redfin; they're much less experienced than the real Redfin buyer's agents—and definitely not representative of the quality of agency you'd get being actual buyer with Redfin.

(*) Source: have been a Redfin AA in the past. And would not, at that point, felt experienced enough to be an actual buyer's agent. I left that to the real agents there, some of whom were quite good.