Ultimately, businesses get all of their money from customers, and those customers are people who deserve privacy. Some businesses have other businesses as customers but those other businesses also get all their money from customers.
If you make all this stuff public, then you are basically allowing customers to be tracked.
And most of the money businesses spend also, ultimately, go to people - their employees or indirectly to employees of their suppliers (or to investors, who are also people).
There's really no way around it except to provide privacy across the board and the best way to avoid tax evasion is by having clear taxation policies that can't be avoided. Sales tax, for example, is an unavoidable tax on business. Property taxes are also unavoidable. Import/Export taxes are very difficult to avoid.
Where our governments go wrong is trying to tax "profits" which are nearly impossible to enforce. Did the company really spend a hundred million dollars buying a patent? Or was the money actually for something else and the patent was just a cover? Is that old painting in the meeting room really worth ten million or is it a fake? If it's fake, is the buyer a victim or was it money laundering? You can't possibly regulate that stuff and transparency into transactions will only catch out idiots. Most people running big businesses are not idiots.