An overlay of an existing website (obviously not on the original domain name) would allow for the demonstration of how a specific bot conversation would look on a potential client's own website without actually installing it first. This would be great for demos before a potential client actually decided to pay for the bot.

This would not be for live use as SEO would be ineffective, but for visual demonstration in a "puppy dog sale" format it could help to close a sale without installing anything on the client's website.

I say for "almost" any website because the simplest implementation would be in an iframe and some websites break out of frames... but there may be another non-iframe solution that would allow overlay demonstration for those types of websites as well.