There's an ongoing investigation of a memory leak in gnome-shell - https://gitlab.gnome.org/GNOME/gnome-shell/issues/64
And some people are making a little hurricane in a glass of water about it. GNOME doesn't give a FUCK about users; look at this PIECE OF SHIT which LEAKS MEMORY ALL THE TIME.
Memory leaks are just bugs. You can go and fix them. You can help developers investigate them. You can sit quietly if you can't help. Do not pile on developers who are already busy looking at this.