With a fairly large network of about 1 million vaults an IP + Service probe could be used to bootstrap (clients could also opt to respond) but also potentially introduces the newcomer to a fake SAFE network populated by other targets and their files.
This would quickly become suspect as users begin realizing there is segmentation occurring. Not being able to contact your friend or access that resource you were told about would quickly raise eye brows and result in a counter black list of malicious IP’s. The effort initially being led by trusted individuals like the devs and longstanding community members.
Tor currently uses E-mail to work around this problem for bridges. Blacklisting the E-mail service providers has economic consequences while also being impractical as there are just so many. There have to be solidarity among them all for it to work. Another route would be for governments to either ban encryption for E-mail services which is unlikely or demand that an automated system be designed to read and erase requests while simultaneously blacklisting the given IP.
Another idea is that bootstraps IP’s could become as valuable as ones personal house keys by making them difficult to obtain and therefore slowing the growth of the blacklist. The idea is to have Maidsafe ship two files. One is the binary with the hard coded contacts for those living in less restrictive regions. The second is a list of randomly chosen bootstrap IP’s that requires the prospective client to do a long CPU based hash calculation to obtain one of several embedded IP addresses. Each taking several hours for even the most powerful CPU to acquire.
In such extreme circumstances the difficulty of obtaining these IP’s would likely be alleviated by private social networks in which these people would share the obtained IP’s with other like minded people with no apparent ties to the government (i.e Friends). The level of care in handling these IP’s would resemble the trade and distribution of illicit substances. 
