Not a fan of asking to log in to continue after the user has entered data. It's a dark pattern that indicates you are trying to inflate sign up numbers rather than just making your site sticky enough that people want to sign up organically.

In our case, in order to run the queries we need to provision a sandbox and connect to your data sources to give meaningful answers, unlike a general purpose chat. We need to have some authentication to prevent abuse here, but the product itself has a free tier so you can use it without paying or needing a card.