If someone invest small amount of money in Bitcoin because of curiosity, it's completely fine.
But if someone invest small amount of money in Bitcoin because the believe Bitcoin price will increase 10,000x in the next few years, it just a dream and they should learn how to make more money, not by investing in Bitcoin.
And from what I observed some newbies are investing small or big in Bitcoin without any knowledge or without even trying to learn the basics of Bitcoin like understanding how Bitcoin works.
It's a very no-no for me, even how big or small your investment is and without proper education or learning, it's overall bad.