We’ve a decade of data showing that almost all pc gamers will not use a storefront and launcher that is not steam

You are literally the one who said that such data exists and is clearly available if some random person on the internet has examined it. You are the one making a claim, therefore it is your duty to provide evidence of your claim, which you stated is in publicly available. If you instead meant that said data is simply anecdotal data based on whatever conclusions you figured is correct, then sure, I’ll take that. Just give us a link to it.