People should not just invest into crypto or tokens they need to study and check what are they going to invest in the reason why they got scam is because they invest into something they just saw and think it will be greater than bitcoin because of the false promise of the creator of the coin or groups that it will surpass and the greed of the new comers kicks in and investing sometimes everything and they get wreck by this groups.
This is why checking the fundamentals is an absolute key to avoid being trapped in FOMO and avoiding greed, novice investors need to do research before investing because other coins or tokens often promise something beyond common sense, there are even new coins that claim to be "Bitcoin killers". Beginners should never buy crypto just because of trends or other people invitations, before getting caught in the evil intentions of certain groups, so it is necessary to read the project whitepaper, learn about the team behind it and understand what problem the coin or token is trying to solve.
If the coin creator or the team responsible for the coin promises large guaranteed returns, that is a major red flag of a scam. Beginners should always remember one thing, there is no free lunch offered by any party without expecting anything in return.