There's two types of bridges: published, and unpublished.Published bridges are the ones you set up to help dissidents in Iran and whatnot - the folks who administer the bridge lists will give you, I think, 3 bridge addresses if you send them an email from Gmail with Bridge List in the subject line. They also have a few other ways of spreading the info. They do this so that even if China or Iran tries to get the list, they can only get a few at a time. But while they aren't as easy to find out as hitting the Tor metrics page, don't count on it being private, otherwise those dissidents couldn't get on.Unpublished bridges are identical, except you choose not to allow anyone you don't personally tell to know about it. Some groups ask folks to do this and give the relay addy directly to members of an affected group. Your ISP records will still show it connecting to known Tor relays, so if your goal is to completely hide your usage of Tor for complete deniability, then setting up a unpublished bridge on a cheap host will give you that.Once again, it's all about lowering your exposure if you are engaging in activities that could result in loss of freedom. I've been to prison for the heinous crime of growing a plant, and it's not an experience I'd recommend to anyone.Safety first, convenience of a site loading at your whim comes a far second to me.