What is the punishment for afk tft'ing for worlds tokens and previous tokens?

Should i just start doing this exploit also?, because some people on my friends lists are doing it and they are very adamant that riot wont do anything about it or strip their already "earned" rewards away. One of my friends lists members said he already got every icon and chroma by just afking in a tft game and he gets around 5th about 30% of the time, since others are afk in normal games aswell.
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