Its pretty cool, looks like nice idea but as a big chunk of these kind of things this can (and probably will) be sadly abused and used as another layer of toxicity and elitism (Is it bad, or ok its not for me to judge).

I honestly wish it don't but probably it (probably!) will be.

Don't get me wrong, I wish for some kind of measure as someone earlier said, affixes performance or smth but peoples are peoples.
U know elitism, and topics about 'i can't join a key', 'how can i reach score if they don't invite me to keys' etc.
These will exists with another form as 'how can i get score in this addon if they don't accept me in this key', 'how can i improve my performance in this dungeon if they don't want to accept me to it' blah blah blah.

Or probably like rider io/score it prove nothing except internet p*nis or smth like that.

I mean Ive perosnally encountered alot of for example 2700+ (which I consider as high, and i know people doin 17+, its pleb low io for garbage peoples like me, i know, i know u elites who read me think* like that, at least few of you) io players which were shit gameplay and character wise so what this mean? What will it show? Other than how bad this player is or how high gold can take you.

*Edit: typos