Why Arbitrum for layer 2?

Arbitrum gas fees are high (7$). Most of exchanges don’t support it. Then why Arbitrum?

Dev Protocol is already deployed on Arbitrum

Arbitrum fees are grown too much
Deploy on other layer and ask users to move there. D-app projects constantly do that
There is Matic, Fantom, Avalanche … (all compatible with Meta-mask)

The ecosystem surrounding L2 and Ethereum will bring even more user-friendly gas fees with the roadmap shown below:

We also need to consider the decentralized nature of our protocols and network effects.

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Do Ethereum PoS side-chains have decentralization problem? They reward validators. Don’t they?