TBF, even when bitcoin's mempool is congested AF players pretty much just turn to low fee altcoins as they are more familiar with them hence, easier to use as oppose to LN which needs a decent amount of time for the learning curve.
Most of altcoin blockchains can give people cheaper transaction fees than Bitcoin blockchain. Security is good, risk of reverse with Bitcoin blockchain is zero, I can say it's is very small so assume it's zero, but if people only need to move small fund, use altcoin blockchains good alternative solutions when they can not afford to pay expensive fee with Bitcoin blockchain.
Though I still have a theory that a very few folks could be using LN to gain more privacy since tumbling and mixing are prohibited in most crypto services.
When Lazarus use Lightning Network to launder their hacked money, Lightning Network will be banned and the Protocol will be sanctioned, like Tornado Cash and its source code. The world doesn't stop spinning and cryptocurrency world will continue to be more weird with more serious regulations from governments globally.
Tornado cash was one service, one smart contract, much easier to sanction, and contracts are still up anyways because there's no way to stop them
do you really think they would sanction a whole network like the LN? that would be pretty much like sanctioning bitcoin itself or eth main net
a bit weird idea.