Because these large tech companies don't pay taxes currently. The current tax laws have a huge loophole in respect to large foreign internet businesses. Now they're trying to close that loophole.
I think it is impossible to sell anything in the EU without VAT, which is a much higher taxation rate than profit (not as percentage, but as money: VAT is 20-25% of the product or service price, profit can be as low as 1-5%.
What the likes of Amazon, Google or Facebook are not paying is profit tax, pretending they have no profits. French companies that have no profits also don't pay profit tax.
