Because WSB is a den of debauchery and trouble making. Its had direct and indirect impacts on markets.
It also drinks piss and monitors where dogs shit as a market indicator.
Its not something a publically traded company can really be associated with.
It has real market-affecting power, so that's power to them, publicly traded or not. They probably get deals with/money from high-frequency traders using the data. I don't believe they would axe it. /r/wallstreetbets is still going strong.