Well, while doing that, somehow I missed a detail, this detail being that #marketplace:shops is still not locked.
Suggestion to make this post came from a comment made by NoBanana
First, it would fit with the category #marketplace being TL1+ locked. If this restriction is going to be kept, then the shops section should be affected by it.
Second, apparently people have been posting trades on the shops section, which don’t belong there at all.
I’m not going to suggest increasing the TL requirement because it would be excessive. Technically, users have access to most functions at TL1, so that was my safest pick, also because TL2 already takes noticeably more time to achieve than TL1.