>>23764595gfe has an actual definition, but you could argue that everyone in Hololive provides something like "experience that you COULD have with your gf" rather than "gfe" per se. some people just want experiences-you-could-have-with-health-minded-dork-gf experience, while other people want experiences-you-could-have-with-autistic-suffering-weeabu-gf.
not even necessarily in a sexual/romantic way and sometimes even when the streamer is not aware of it or discourages it. every single streamer, just by streaming, provides some kind of "experience". same way someone could listen to a good fatherly figure dude streamer for the "experience with dad who likes books and woodcarving and cooking experience".