In my observation,
1. Litecoin : Oldest altcoin surviving which was announced here.
2. Dogecoin: Had ANN topic here.
3. Ethereum : Did ICO here.
4. Crypto.com : Did ICO and bounties.
Good observation. Among these, Ethereum is probably the most successful altcoin and project that we have today because of its blockchain. It is home to hundreds of thousands of projects, and many of them are pretty successful, especially some decentralized exchanges and swaps, such as Uniswap and Raydium.
let's discuss on why we still run behind altcoins/tokens even after lots of scams.
It's because they tend to be more profitable than Bitcoin in the short run, simple as that. Most people trade altcoins because of the potential profits they can generate, and only a few use them for convenience such as lower fees and stuff.