Bwahaha, no it doesn’t.

Legally ‘corruption’ doesn’t exist, as in there is no single law saying ‘corruption is illegal’. (What is ‘corruption’ exactly?)

There are laws against bribery, which does generally only apply to the government, but in many locations applies to pseudo-government roles like notaries, apostiloes, lawyers, etc.

There are laws against embezzlement (a type of corruption), and those definitely apply to private individuals.

There are laws against insider trading, a type of corruption. Those generally only apply to businesses/private folks, not the government, with some exceptions.

Then there is the various kinds of fraud, blackmail, etc. Most people would consider them corruption too. Those apply to private individuals and government agents too.

And many more. It’s a smorgasbord.