CSGO Won't Open Without Having FACEIT AC Open

I never had such a problem with csgo/faceit before and it is really weird.
Till yesterday csgo worked well. Whenever I played faceit or not. But suddenly today, csgo won’t open for me from steam. It showed the running in library, then syncing, and it closes. Csgo appeared for 1 second on task manager and closed.
I’ve tried many things I found on the internet but nothing worked. Until I found a comment to have FACEIT AC open, and it actually worked.
It still appears weird because on steam library it shows: running>syncing>closed then the game opens.

Could you please explain why it happens to me? Why I can only open csgo when I have faceit ac open?

Again, just to open csgo, regardless of faceit.