Having an easy way for scammers to scam doesn't implicitly kill the platform.

ETH didn't drop due to shitcoins created on their chain, ETH dropped due to lack of performance & overvaluation.

For instance: The web allows anyone to create sites & apps. They're a ton of scams happening on the internet everyday. And yet, the web is dominating more than ever.

Steem will be fine, NFTs & SMTs will only boost its use-case & value.