I would think meself has it about right. The clips sound pretty good - this is clearly meant as an expression of admiration.

It's not as if you'd been playing badly and might be embarassed by them being out up there formothers to hear. And it's not as if this was a bootleg of a record you were putting out.

And if the person putting them up was playing in the session - well, if I wanted to stick a clip up of a session I'd played in, I don't think I'd feel I needed to ask the permission of anyone else.