Do you know why it's hard for Bitcoin's layer two to grow significantly?

One core reason is liquidity. Most of Bitcoin's liquidity is held by Bitcoin OGs, exchanges, and institutions, and they won't exchange real Bitcoin for fake Bitcoin; this group of people has a deep understanding. You can't just casually create an EVM layer two and trick them into giving away their Bitcoin; that's impossible. You can only attract retail investors to play, but retail investors have fewer chips.

In contrast, for Ethereum and Solana, the whales on Ethereum and Solana really do play on their chains, so the liquidity is abundant.