you must be using the flatpak[flathub.org] of steam for this to work, despite this fix not originally being for the flatpak version, i tried other versions and continued to experience the same issues.

(04/16/24: these fixes seem to be working for the RPM version of Steam as well)

here is what you need to put into the terminal:

sudo dnf install gperftools gperftools-devel gperftools-libs.i686

this will install some necessary packages

next, input:

sudo dnf copr enable kylegospo/hl2linux-selinux
sudo dnf install hl2linux-selinux

after doing this, i continued having issues hearing voice lines (more specifically, tf2 was unable to create decoders for the voice line mp3 files). in order to fix this, input:

sudo setsebool -P selinuxuser_execheap 1

then install tf2. make sure you are using the linux version, and not the proton version (which will crash upon loading into multiplayer). steam will sometimes autoupdate tf2 and replace the linux files with proton files, which can be solved by going into properties -> compatabiliy -> force the use of steam compatability tool and checking and unchecking the box. this will reinstall linux tf2, so you will have to re-add the symlink in the next step

(1/13/24 this does not happen anymore and hasn't for awhile, but i'll leave this here in case others still have this issue!)

access the tf2 files through manage -> browse local files, go into the bin folder, and delete libtcmalloc_minimal.so.4. open the terminal in the bin folder, and enter:

ln -s /lib/libtcmalloc_minimal.so.4

after this you should be set! this fix should allow you to play tf2, and play multiplayer if you wish!