Rosetta implementation is necessary to list hive because hive Blockchain is not currently supported on Coinbase wallet. Coinbase wallet is compatible with erc-20 tokens, BTC, doge, BNB chain, etc but not with hive.
They will not implement their own Hive node. Is from our side the implementation of the rosseta API endpoints because we're not erc-20,etc.
It's not a question of money or diplomacy, it's a tech thing