Plutonium

Thomaskuhh How can I set one up?

I haven't played this in at least half a year now after my account progress was reset. I used to play on public match with bots just to have fun and level up/unlock camos naturally, like combat training on BO1. But to my surprise, there is no 'public match' button anywhere on the game, just the server browser. Does anyone know why it was removed?