It’s worldwide revenue not just in the EU and revenue is a lot more than profit.

If Amazon were to get a 4% revenue fine that would be equal to 72% of their yearly profit. Meaning it would seriously eat into their margins.

Facebook had about 1/10 of their revenue as profit so a 4% fine would take about half their yearly profits. Doing something illegal in Europe to double your worldwide profit seems not so easy to do.