I mean you can pay anyone with the vTXO, but in my understanding that recipient implicitly also becomes a "user" of that specific ASP. You trust that ASP to not do something nasty (like double-spend). If it does you don't lose your funds but it still gets expensive since you need to unilaterly exit to base layer. The better way to sweep if you have funds with ASP1, ASP2 and ASP3 whom you trust is to do an AMP lightning payment.