FACEIT recently added their own rating system, HLTV has their own proprietary rating since forever. Meanwhile we're stuck with an old, basic, and useless "Score" system which is (1) not upto the competitive standards of modern CS, (2) I've never seen anyone talk about nor care about. The word choice is terrible, and the math behind it is outdated, and the same metric used in DM, casual, and competitive modes with minor tweaks:
Steam Community :: Guide :: Lulu's guide to CS2 score calculation
Steam Community :: Official Guide :: How are player score and money awarded?
We need a proper official player rating metric along with a fleshed-out "360 stats" feature. Right now, people use third‑party metrics like Leetify’s Aim Rating, and they end up shaping the community narrative by default. People use those stats all the time to check whether someone is hacking or not, for example. Valve needs to take narrative control back from third party rating systems and establish a proper in-game standard.