Per unanimous consensus at Commons, users who are neither confirmed nor autoconfirmed nor above must be restricted from transferring uploads from one local wiki to Commons. In other words, IP editors (who are neither confirmed nor autoconfirmed) may be also restricted from using the tools.
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This task, IMO, must apply to the FileImporter extension, (already done, perhaps? per T370598#10105456) the Upload dialog, and any other applicable tools that perform cross-wiki uploading. Of course, technical limitations of making changes to these tools might make this task impossible to fully achieve.
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Abuse filter was already made at Commons to implement such restriction, but I can't help wonder whether it's adequate to prevent such users from misusing crosswiki tools. As I think, most (if not all) local wikis must also restrict such new users from misusing crosswiki tools
Per a study conducted by WMF on English and Arabic Wikipedia users (document), many uploads by new users tend to be eventually deleted primarily for copyright infringement and/or out of the project's scope, and many survey participants (new to uploading) were "marketers" or "self-promoters".
The implementation was discussed especially at Meta-wiki, but almost no replies have been made from what I've learned. Implicitly, no opposition or objection was raised.
tl;dr Besides Commons, most local wikis must also restrict non-(auto)confirmed editors (most likely especially IP users) from transferring uploads from local wiki to Commons. (Almost) no opposition to such implementation was raised at this time.
EDIT: Just realized that IP editors may be already restricted from uploading files to or in Commons.