Your math calculation is nice to see but unfortunately you didn't take some things into consideration for your calculations. For instance, There would most likely be varying amount per participant – all participants won't receive same amounts. That, and the fact that layerzero has about 500K+ active Mainnet users the last time I checked. If you factor all of this in, you'll see that the allocation will differ per user.
This is only to get the rough idea about the ZRO per user. Yes. this will be change by user to user. Also they may be check the wallet history like the celestia airdrop. Then they can remove the airdrop farmers and the bots.
Eg :
1. number of Ethereum transactions.
2. Wallet age.
3. First transaction date.
4. ETH staking
5. Voting