If you haven't heard or know about them, don't jump to conclusions about them. Arbitrum and zksync are layer 2 projects that have made their mark in the community recently, you can't find them on Coinmarketcap because they haven't been announced for public sale. Aptos is a project of layer 1, as far as I know, this project is invested by Binance Lab and Coinbase Ventures, the project is getting a lot of attention on twitter recently. Can be considered as a competitor of Sol or Near... just like the two projects above, Aptos just ended their mainnet and has not yet announced a token release date. All are considered gems for the upcoming bull season.
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Indeed mate that not all project that still not listed in Coinmarketcap means no future at all because there are several cases that those who someone called as Scam project turns out as a GEM and make others instant millionaire though this is hard to find .
because we cannot predict what will truly come until it happens.
so either trust them or never .