Update - Is this new? Here https://help.dropbox.com/installs/dropbox-for-macos-support#How-to-opt-out-of-Dropbox-on-File-Provider it seems like one can opt out after all. But one has to install it there first, which is risky if it does not work as advertized.
How would I go about confirming this option so I don't get an automatic install? Or can I prevent an update? Thanks