Anyone that reads the LN Whitepaper , can see stealing BTC from LN, requires nothing more than evading their time locks.
So you know , you can shove your No where the sun don't shine.
there are a few techniques
even i wouldnt risk more then $60 and definitely not with someone i didnt trust.
and even then i wouldnt be comfortable
to me its just a side service. not something that should be treated as bitcoin. just a side service.. like escrow
segwit on the other hand. now that is a think of empty gestures and a shambles of code just made to set up a tier network and delay real onchain growth to try to push people into thinking LN is the end goal...
.... right up until the point that people use LN and then realise its limitations and then transfer out to sidechains(altcoins)