Unspoken rules for NFT issuance by project teams: Project teams that genuinely want to airdrop to you issue SBTs; Project teams with vision but still undecided about airdrops issue freemint NFTs; Project teams still undecided about airdrops but want hype issue low supply, low mint price NFTs; Project teams that don’t want to airdrop, want hype, and want to cash in issue 10K series high mint price NFTs.