Weird question. The first 6 positions are bitcoin forks that you could get for storing bitcoin on a wallet or exchange.
Probably no. Except for BCH & BSV, the rest of the four could not have been claimed by having it on an exchange. You needed to have it on an address and claim with respective fork's wallet with the help of private key.
And what do projects like HEX, Stellar, etc. have to do with bitcoin airdrop?
All these were claimable if you had BTC on your address on a certain block. But, unlike the first 6, they had a time period to claim by signing a message.
What is Rhombius? What is it, some unknown shitcoin or something? What does it have to do with bitcoin airdrop and its forks represented in the first half of the list?
Rhombus is another Alt that was claimable to BTC HODLers. You may read detail about it @
https://rhom.com/airdrop.
Just some random list of tokens that for some reason was placed in the bitcoin airdrop thread. It looks more like a hidden shilling of some next shitcoin.
Each and every Crypto, that I have mentioned in OP, could have been claimed by BTC HODLers at some point with their private key.