I'm considering adding a feature allowing the chatbot to reply in any language.
But, at the same time, I'm not sure how useful this might be because I assume that people who visit an English website speak English, and the same for other languages.
What do you think? Should I build this feature for Chatio.ai?
To assume that people who visit an English website speak English is to limit your business opportunities. You should have a feature to "translate this site to [...]" right off the batt and then capture and analyze the stats, to see the prevailing non-English speaking user groups are. Once done, incrementally add to your Chatbot the capability to reply in [...] language. And don't forget to put a banner that announces such capability.