Indeed... assumption is the mother of all fuck ups

May I ask what lead to you assuming that Bitcoin Core would just use Tor by default? I'm curious to know if there is a learning opportunity here for everyone.

It was a stupid misreading, out of context, of some phrase like "Bitcoin Core v0.12 and later automatically tries to connect to Tor" [following context omitted; in
https://en.bitcoin.it/wiki/Setting_up_a_Tor_hidden_service], but I'm not sure that precisely was the source.