The [coinbase] tag does not have a description yet, however seems to currently be used for both the business and in the meaning of 'coinbase' transaction.
Does the [coinbase] tag refer to the business or coinbase transactions?
On second thought, I think that was not the best solution then.
I would like to propose the following:
The tag coinbase.com should refer to the company Coinbase.
The tag coinbase-transaction should refer to Coinbase Transactions.
The tag mining-reward should cover more general questions about mining rewards.