It was a temporary limit by precaution to not reach the limit of the OpenAI API, I will increase it later this week. Also I calculated this limit with the previous davici model in mind that I used when I started building this bot. I later moved to chatgpt-turbo that is cheaper, so there is not reason I cannot increase the limit.
It's indeed possible, and you can easily find already existing OSS ChatGPT implementation that can serve as a base. I am more targeting no tech people or just the ones who don't want to bother building it / hosting it.
Thank you for your question and for bringing up your concerns. My micro-enterprise is registered in France, you can find more about me and all the side projects I worked on at sandoche.com, hope it helps and feel free to use to contact button to get support :)