I think it was part of the initial tokenomics, sort of an appeal to authority, if the team withdrew all their liquidity he could come in and supply the rest as liquidity, the entire project is a meme ponzi scheme IMO and it adds to the meme factor. the same effect could have been done with a contract proving liquidity couldn’t be removed.

Only to Vitalik, presumably as a marketing tool.

Shib’s creators donated 50% of all shiba ($11B worth) to Vitalik to create scarcity.