Large tech companies employ hollywood accounting techniques to continually reinvest surplus revenue. In doing so they rarely post any significant profit, depriving the taxmax of corporation tax.

This 'reinvestment' is used to compete and drive profitable competitors out of business. This is an unfair practice. The result - no profitable companies, smaller taxable base and nothing for the taxman to collect.

The bigger the juggernaut, the more influence they have on the taxman ("but we're contributing to pay/income/property taxes - surely you don't want us to relocate abroad"). Large multinationals use their corrupting influence to strike sweetheart deals and use these deal-made tax savings to abuse the market even more.