If your hosting costs ever mount, I can recommend Hetzner for hosting, they'll give you a whole bunch of bandwidth for free on their smallest plan ($3/mo) and you can even buy a 3 Tb pipe (IIRC) you can saturate for $20ish a month.
Otherwise, I'm sure some organization will be happy to provide some bandwidth in exchange for a shoutout.
Otherwise, I'm sure some organization will be happy to provide some bandwidth in exchange for a shoutout.