Unless I'm missing something (or things possibly changed since I first became part of TER community), majority of a provider's TER profile is info provided by hobbyists. So exaggerations of tgirl dick sizes in profiles would be a hobbyist generated phenomenon.
Not surprising to me for a few reasons. I'm a ferocious 5.5" - 6"

but many of my clientele have never played with another cock so I can see some potential POV skewing for that reason. I'm always honest in convos with potential clients about my size, but many times while they're playing they'll comment that I'm larger than I said (sigh, those are happy moments for a tgirl hooker, almost as good as "you're better looking in person" lol). As an aside, when I do porn shoots, the "good" camera ops know how to use POV angles to give illusion that I'm a sassy 7"
Relatedly, a good portion of tgirl porn stars popular with fans are well endowed (e.g., Kimber Haven, Liberty Harkness, Nina Lawless, et al). From my phonesex experience, many of the fantasies of gents involve big tgirl dicks. So possibly some of the inflation in hobbyist reviews is related to fantasy fulfillment. In other words, in a way the reviewer is bragging about the tgirl dick he had.
At the risk of taking this discussion thread off topic (No! Not that!) I'm curious whether similar exaggeration in reviews takes place with other provider attributes? e.g., Tiddie size, booty'ness et al.
xoxo
Kacy TGirl