The short version
Privacy
Tour-date alerts stay in a file on the server that runs this site.
The tour list asks for an email. That is the whole collection. It is used to send a date when one is real.
Until an email provider is connected, nothing is forwarded. The list is not sold and not handed to an ad network. YouTube embeds load from YouTube when you open a clip.
To take an address off the list, send the tour form again with that email and say you want it deleted.