LN is a "soltion" Blockstream (tm) created to solve a problem Blockstream created.
"Solution" because it does not actaully allow fast and cheap "cash-like" transactions as Bitcoin was originally designed to do (and still can easily scale to Visa-like levels).
From day one Satoshi had built Bitcoin to scale to to Visa levels of transactions by simply incrementaly increasing the block size over time. Blockstream hijacked the Bitcoin Core GitHub repo and soon after disabled several core features and have since refused to increase the block size while pushing their products (Liquid and LN) as "solutions" to this problem they created.