I believe it's a chicken and egg situation because the reason why usage of the Lightning network is low is because there aren't that many services and merchants have adopted the off-chain payment network.
Bitcoin faced with same barriers years ago but its adoption grew well over years. Lightning Network had very low adoption and only grew more quickly since 2020.
With expensive transaction fees on chain, off chain solutions like Lightning Network will be considered to use more. The biggest barrier for LN is, to use LN, people must use Bitcoin on-chain first.
But if suddenly all casinos started accepting Lightning deposits and allow withdrawals through Lightning then I'm quite confident that Bitcoin users would start believing that it's a feasible payment method, and there's no need to convert their Bitcoins to altcoins too.
Rome wasn't built in one day and Lightning Network has some years of building. I believe it will grow more and get more adoption from casinos, merchants.
The advantage of using the Lightning Network is not just for cheaper and faster transactions. It's a good layer that adds privacy for your transactions too.
Is it risk that governments will sanction Lightning Network like they sanction the source code of Tornado Cash?