NFT can be a good investment to try but sometimes many of this NFT project do not stay for longer period which at the end the price can become less or start to be going down because of less liquidity. I don't see any thing in free NFT because most time it's not tradable that is why many people that knows much about the NFT market do not bother much about the free ones.
I can't even consider it as an investment anymore. that doesn't make sense to consider illiquid asset as an investment. I think that you must also see how many NFT has been going down so hard. You can see the old NFT like ghozali or something else. It's worth nothing right now. The free NFT will perform even worst than it caused by mostly of free nFT never got any hype and the were not even valuable enough to be priced in fiat money. Thinking about NFT as an investment is not right