Yes if there's a risk and you don't know if you're going to earn profit then yes you can consider it as another way to gamble your money. Actually a lot of things can be consider as gambling even bounty hunting since you don't actually know if you're going to earn money after the campaign.
If you think that NFT can give you profit, you can try with a small amount to see if that is work for you or not because some people who use big money can not always make money from the NFT project. But some people will not say that is gambling because they see the potential to make a profit from the project, so they decide to invest in that project while they do not know if the project will succeed or not in the future. It seems that people are greedy to invest in an unknown project without searching for more info.