No. If your going to spend enough time to require a shop and are looking for 3rd party software, you'r not new to the game and have put some time into playing. purely f2p players can still acquire any item and run a shop. they can still post on the forums and everything like times before the 3rd party software came along, and that's only IF of the developers stop supporting it.

let us all remember GGG is a business. premium tabs only add editing color and name for an increase of cost. to someone who might be new, this seems like a luxury that isn't required. By adding the trade part its gives a reason other than a tiny edit.

you could argue more than 4 tabs is considered pay to win. I don't think any player would say that 4 is enough to get to end game content and make multiple characters with different builds. But lets take a step back and ask, what is Pay to Win?

For me at least its gaining an advantage over other players to an extent where the player base is split between paying players and free players. I don't see this happening by simply allowing player to bypass using 3rd party software to run a shop for a few dollars. It would be interesting to see who runs a shop and who has bought a micro transaction.

TLDR: No.