Look at
Ethereum. They implemented smart contract using which new tokens could be issued. Now, BTC fork
BCH has Simple Ledger Protocol, using which one can do the same. BTC HODLers got it for free.
Look at
Grin. They implemented MimbleWimble protocol for privacy. Now, BTC airdrop
MWC has implemented the same. BTC HODLers got it for free.
Look at
BAT. They implemented in-browser ad through Brave browser and rewarded end user. Now, BTC airdrop
CPD Token is going to do the same through CPD Browser. BTC HODLers got it for free.
If every new tech in crypto field goes to BTC HODLers for free, why would people invest in new tech?Not only these. Ripple created a payment protocol, which was forked by Stellar, while XLM was airdropped to bitcoin holders. This is happening for long.
Moral of the Story: HODL Bitcoin and everything will eventually drop on your lap.