Paypal transactions are not public.  Bitcoin transactions are.  Every single one.  Even lightning devs admit its inconvenient and difficult to use.  Most people don't know how bitcoin works or how to get hold of it,  let alone want to set up a lightning node in their home. Which leaves it to signing up with alby custodial  or similar (no more private than paypal), and even that is complicated for average person who definitely does use paypal without much difficulty.  I hate paypal, i WISH bitcoin was more convenient and more private, but wishing it does not make it so.