backpack.tf trust doesn't make sense in the slightest

[Mrs TS]

I like the idea of leaving the old trusts but making it so that any new trusts show proof.  That might be a lot of work though, but it makes the most sense and will keep the older traders happy that all their hard work did not just disappear.

[Spyromancer]

I know for a fact that trust ratings where there was no trust given to the rating receiver (ie. paying first through F&F Paypal) get removed, but this system hinges on the ratings being reported. If it can't be proved either way, the rating remains, which makes it rather easy to manipulate if a concerted effort was made by multiple parties.
Remember that you can always insist on a trusted middleman if you have any misgivings. If they insist on using their own middleman, or outright refuse, abort the trade and report any accounts involved to Steamrep directly - just don't expect a ban.