IRC would not be useful for Hack Club as it's only text. Hack Club requires software that allows us to upload images, create canvases and most importantly, call with others.

Not saying there's a turnkey solution at the moment for your exact needs, but even with your current $5k/year budget something interesting could be built with the "modern IRC stack" that https://irctoday.com/ uses, for example. Call support would have to be done by integrating Jitsi, but it's been done before as seen in https://github.com/kiwiirc/plugin-conference and https://convos.chat/doc/features#video-support