No? Government is the people currently elected. Nothing to do with courts. And law was decided by previous governments. Giving money to the current/future government to create new law which you like is called lobbying, or bribing (whatever floats your boat).

Taxes don't only pay for what you have defined as "government". They pay for everything the state does, including courts and enforcement of laws.

Yes, but if you demand that everyone pays proportionally to the benefit they get, then the threat of moving capital to another country has an outsize influence on politics within the country. So the rich get even more say about how taxes are spent than they normally do, by literally voting with their wallets. And thus state’s spending is optimised to protect the interests of the rich with little regard for the poor.