Filters especially make sense as query params as they are non sequential but still visually readable as to what they do.
URL slugs make sense for sequential pages that are hierarchical but make no sense for non hierarchical data/routes.
Services can force tracking into links by encoding the whole url into a shortlink that makes it impossible to just remove the tracking alone as everything is encoded into a shorter non editable string.
If I am handing out maps to your address, letting people know who is publishing the map is generally a good thing.
This is like saying having a return to sender address on mail is an invasion of privacy.