If they wish to have it, why not. Everyone is free to have his or her own coin in the crypto space. It is a decentralized system, which is not under the control of anyone. So, they too can have theirs.
You are absolutely right, but if Google makes coins and does not have a good function or effect in the future, then I think the coin will only be in vain and will not provide benefits to investors, but if Google makes coins and has good functions for In the future, I am sure that many investors will be interested to investing in Google coin, moreover Google is one of the biggest companies in the world and it will make people believe to invest in Google coin.