Shiba is listed on Robinhood and it is completely normal for sharks to take profits. If you were a shark, you would do the same thing.
and if you feel there's something wrong for ex here in shib, then don't spend any penny buying this meme token. no one is obliging to buy a hyped-up project. it is always your prerogative to get involved in this type of project. if your instincts is saying that this will go sideways, then don't push yourself into this token.
as the amount revolving on this token is quite huge, hard to conclude that there's inside job. we also don't know if these whales are capable of communicating with each other.