I mean Minecraft started off like that. Terraria is following behind it. Among Us, a $4 game on Steam released in 2018, suddenly became a meme and huge out of nowhere. Fall Guys, made by a small studio that mainly did web, Flash, Facebook and mobile games for most of their existence, came out of left field and created the top game of last month, which (if played right) is an instant brand because of their simple yet infinitely customizable cute characters.
There is still real competition because the big publishers cannot stop the small developers.