download warnings tell you to use a bridge so a local adversary can't learn you're a tor user
The last warning in the warnings list says
""" Use bridges and/or find company
Tor tries to prevent attackers from learning what destination websites you connect to. However, by default, it does not prevent somebody watching your Internet traffic from learning that you're using Tor. If this matters to you, you can reduce this risk by configuring Tor to use a Tor bridge relay rather than connecting directly to the public Tor network. Ultimately the best protection is a social approach: the more Tor users there are near you and the more diverse their interests, the less dangerous it will be that you are one of them. Convince other people to use Tor, too! """
But simply using a bridge probably doesn't help much. Maybe if there were special pluggable transports that helped especially well. It really depends what your adversary is doing to discern Tor users. Are they using a list of destination IP addresses? Probably not. Are they using DPI? Maybe, if they bought some DPI box and configured it to do that.
Using a VPN can help, sometimes, but it also just shifts the problem to some other place that gets to track you.
I wonder how best to capture all of these nuances in a sentence or two for the warnings list.