Well, you say they don’t, but that doesn’t explain Mrs B’s experience yesterday when she got a receipt stating her address (fine) and our phone number!
I use Paypal all the time and wasn't aware they had my phone number. If they do, they certainly haven't phoned me - neither has anyone I have bought from.
Whenever a site insists on a telephone number I give 00000000000, or if this is rejected I then give the site's own number. The latter always gets accepted IME.
Corbyloon. Sorry to be pedantic, but my question reads "Paypal. Do they automatically give out your phone number to people you’re buying from?" The business about what sellers do/don't do was secondary.
Woofgang: well, that is odd then, as Mrs B's has our number, loud and clear.