No Cardano is a scam.
Yes, Cardano can be seen as a scam due to its unfulfilled promises and frequently missed development deadlines. Its technical complexity makes the project hard to grasp for many, which fuels distrust. Compared to competitors like Ethereum and Solana, Cardano struggles to build a strong community.
So called smart contracts and cross-chain bridges are a hacker's paradise.
Virtually every single one that has ever been developed has been hacked and drained of its funds at one time another, often more than once.
I wouldn't be surprised if the "hackers" are often the developers themselves.
That is why they are called shitcoins, only good for promoting stupid crap like memecoins and NFTs, and getting hacked and over and over.
A great way for idiots to lose their money. The variety of ways for idiots to lose their money to these scams are endless.