Why does Audiogon need my phone number to send private messages

I've never got a text from Agon just an occasional email when I log in on a different device, usually when traveling.

The only asked for my number to validate me if I was trying to purchase something, not to message anyone.

@jea48 -- Thanks for that tech info.  Appreciate it.

@jcarcopo ....Well, thanks for disclosure we'd perhaps remain clueless about...
'Roon porn'....?  One can wonder about the 'staging' of such.....

AG may have my cell number, but hasn't yet or ever used it in any fashion.  An email advising I've 'gone rogue' in some fashion is rare in itself, and I've no plan nor intent to 'pump up the volume' on being wayward beyond what I 'do' anyhow....

Doomed to 'postbored'.....*mock yawn*