Everyone should have doubts when seeing "Already earner from Hamster." 
What a time waste it was, thanks god its over.
The rewards we got from Hamster Kombat might be a waste of time but I'll still thankful with them because I received more than $30 from it. I also didn't expect more from HK in the first place because I knew they have a huge community, I accepted that participants will only get less. In DOGS, I received a higher amount with just a simple task to do to be eligible for rewards, so we can say that DOGS is a good project.
And now, the Notpixel. I have never been posted about this post for a couple of months but for us to know, Notpixel is a successful project. They only have a total supply of 250 million which means the price would be around $0.5 to $1. But sadly, I'm not eligible for it because I didn't met the criteria. However, there's more airdrop that worth participating for, let's move on. 
The rewards obtainable from certain projects on the telegram meme games app, like the airdrops,Tap to earn, play to earn, referrers, others, depend on the sizes of the community, the extent of the rewards pool, the budget for the campaign, the ICO sales success etc.
Most people think that hamster combat was not successful because they received less rewards compared to others like the Notcoin, Dogs, Xempire etc. It is likely to happen in that manner because the first of it kind projects on any economy will actually get the hypes and investments frenzy that will boost many of the projects successes. Other similar meme projects that are to be launch may not get the same hypes or investments volumes like the first projects.
In a nutshell, i think that many of the first launched telegram meme projects were successful wether participants received less, or received huge rewards on others. The success of any of the meme projects does not depend on the amount of airdrop hunters received because the rewards that every participants receives depends on the factors that i mentioned above. This is just my opinion.