The 5% is PC platform holders' profits, not overall profit. So just the profit that Steam and Epic (and to a lesser degree perhaps CD Projekt, EA, Ubisoft, itch, etc.) themselves make as storefronts. Any money that a publisher like Sony would make from selling their games on PC would go into the publisher bracketJust 5% of profits from PC... and people adamant that Sony should publish their entire catalogue on there.