If you have btc on Cash App, and CA has existing channels with Phoenix w/ sufficient capacity, and they don't mind using that capacity to service your tx, then yes, you might be able to send cheaply and not worry about it.  But _someone_ is paying for the channel opens / closes, and that entity will eventually pass those costs onto you.  No free lunch.  

elvismercury

yeah but again let's say I have bitcoin on cash app which has lightning functionality. can't I send it from there to Phoenix for barely any money? So I pay wayy less fees?  

Kaffi

bitcoin

Inscriptions: the cure is worse than the disease

benthecarman

The principal issue under discussion isn't custodianship and its security vulnerabilities.  The issue is that to get funds onto an L2, channels need to be opened and eventually closed.  If it's five bucks to make a channel tx, that renders migration to an L2 infeasible for a vast number of UTXOs.