Anyone that reads the LN Whitepaper , can see stealing BTC from LN, requires nothing more than evading their time locks.
That is true for any 'refundable' time locked txn, like Atomic Cross Chain Transfers.
If I can stop you from claiming the coins before the time lock expires, i can refund them back to myself (after I have taken your coins aswell that is).. Just have to prevent your TXN from getting on chain.
This is much harder to do than I think you are implying.
Hard for you & me , yes it is.
But the rich guys that can collude to 51% attack or the rich guys that can spam the network until your timelocks expire, it is easy as pie.
* The only poor people able to pull it off , are the Hackers that learn to Hack the LN Nodes, and modify the timelocks ahead of schedule.*
