Hacking government and hacking software are different things. You can't offer TCP/IP $100M to leak you some private keys from the server.
The smaller the government, the more value you could get per bribe (more power located in individuals) and the easier it would be to do it (smaller governments presumably lack layers of security measures against bribery). In case of extremely small government a big corporation could buy it out entirely.
In smaller government there is one and only one person you come to. If this person does not accept your bribe (or "lobbying") then you have to play by the rules.
In larger government there are a lot of competing bodies with vague job descriptions. You can honey them all with varying results. You can oil "layers of security" as well so those rarely help.
Don't confuse big/small government with big/small country. Surely there are banana republics, but I can't imagine you can buy out government of Iceland that easily.
The smaller the government, the more value you could get per bribe (more power located in individuals) and the easier it would be to do it (smaller governments presumably lack layers of security measures against bribery). In case of extremely small government a big corporation could buy it out entirely.