Yes, that is true. Hashshare nodes amount is growing rapidly. Most of nodes are deployed by Korean users. Because mining reward from nodes and bitcoin airdrop is better than getting % from savings in bank in South Korea.
Actually Hashshare is not planning to increase miners for bitcoin airdrop now. Because only few days left until halving and no one knows how the bitcoin price will show itself after halving. And for now it's a little bit risky to increase miners now.