Yes, you can use your WPBot ChatBot on non-WordPress HTML, PHP, or any other type of website. However, since WPBot is a WordPress plugin, you have to install it on a WordPress website first. Just create a default WordPress website and install your WPBot plugin there. It will act as your ChatBot Control Panel. Set it up as you want.
Go to the Settings->Embed and Click to Chat area. Copy the Embed code and add it to your non-WordPress, HTML, PHP, or any other type of website. Copy the code to the bottom of your website’s footer, right before the closing body tag and now the ChatBot will show on that website.