You can read the last FAQ answer in the page source:

We love open source and community projects, so we have decided to make TalkJS entirely free for non-commercial purposes.

When you go live, there's a button you can click to let us know you're using TalkJS non-commercially, and you'll be able to go live without paying.

Note: The non-commercial TalkJS license includes no support. If need want the certainty of access to our great customer support, please become a paying customer.

That was more feedback that the site's not working correctly. Since we're talking page source, I guess we might as well tell them the offending line is anchor tag referencing the wrong div `#question6-a` instead of `#question7-a`.

Hey! Joshua here, co-founder of TalkJS. Thanks for your feedback, you're right! Will fix asap.

Thank you! To answer the user/conversation question:

> two users talking with each other, is that one conversation?

Yes.

And thanks for asking, this means it's not clear and we will have to add this.

I echo this. It's too ambitious exactly what constitutes a single conversation (and what doesn't). Gifts define it right by the pricing or use something that people would understand