[{quoted}](name=Umbral Regent,realm=NA,application-id=ZGEFLEUQ,discussion-id=teU1z3FP,comment-id=0000,timestamp=2020-01-01T15:32:07.043+0000)
Nevertheless, any gameplay related offense that severely hinders your team's chances of winning is best filed under Intentionally Feeding.
This likely won't yield much action. The game's AI will look at feeding as a function of KDA. They could duo top lane and both end up 5-0 when the game ends. How is that feeding? And what if they win? Intentionally Feeding is defined as assisting the enemy team, and Riot has repeatedly said that playing "off-meta" is not throwing.
Coming to the defense of the mystery griefer that the OP describes, whose to say what the intent is? Where is the line between a strategy of camping your top lane vs. actually abandoning the jungle? Is it defined as Jungle CS/Minute? Seems arbitrary.
The fact is, this behavior won't be punished because to determine intent, 1) that intent would have to be obvious (such as typed in chat, or a jungler not taking Smite), and 2) it would require a human being to review the match, which Riot will not dedicate employee time to doing. Similarly it's almost impossible to punish "giving up" without a chat declaration. Is it against the rules for me to split push while the enemy team is pushing another lane, and my team asks me to help? How do you identify when someone is split pushing as a strat and when they're just letting the enemy team end?
Possibly will be looked at if you create a support ticket.