I dont know about anyone else, but I think part of it is that a lot of companies that block sites block PT because of the word talk in the address, also anything that has the word forum in the first section like here it is
MX6.com - Home for the Mazda MX-6 Enthusiast that allows me to access. This is why I dont use and never really ahve used PT eventhough I have a pgt. Plus it gives me an excuse if i dont understand smething then I just say glad mines a ford and not a mazda when i read some the threads here.