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You see it here (again) because is a 99.99% scam scheme. You really believe that those guys have a mining center? 
ohh..Actually no, I didn't see their mining center in real, but I'm getting my btc airdrop reward every month for deployed node in their platform.That's kinda weird for scam scheme ah? oh maybe that's why it's 99.99% scam as you think
okay so I was planning to buy some hashrate after using a trial plan, but now I'm confusing
Firstly I ask you if you believe that they have a mining center, not if you have seen it. Because you will never see it!
It's exactly as you said, you get your "airdrop" as a strategic move in order to be convinced and buy hashrate. Then you will say to your friends and fellows how good they are and paying (lol) so they can join. You already thinking of buying "power" so their plan "works"...
it's difficult when there is a small experience of trust and nobody except me tried their service
What do you mean "experience of trust"?