Wouldn't be surprised if it was Shiba or Doge as these coins are made to bump and dump. This is how the market works so no one is to blame here. If you are the victim in this situation becoming the liquidity provider to the elephants then blame yourself instead of the blame.
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.