Of course they have. Off the top of my head examples include: Grants in the form of tax dollars (e.g. arxiv). To benefit the authors reputation (e.g. numerous scientists, developers, etc personal sites. zacklabe.com as a useful example). As a hobby (I think aiarena.net falls into this category). To collect data for research purposes (e.g. the original chatgpt release, and early recaptcha)...