There are 14,000 games released on Steam every year. What percentage do you believe contain in-game purchases? It's quite literally just the giant AAA venture capitalist backed studios that do this. Just don't buy them.
It's like saying if we allow AI art to continue soon there will be no more humans making art. People will always make art. People will always make games. If all the art you see is corporate slop that's a you problem.