What is the basis for creating a peer group (dubbed FAMGA) or unrelated businesses? Comparing Facebook’s growth (a social media platform) to Amazons (retail and cloud computing) seems pointless.
An important distinction re: territorial taxes is that if there is no settlement of the difference between a foreign tax rate and a home country tax rate then companies are incentivized to artificially earn as much of their income as possible in low tax jurisdictions.
They put the caps on to help with the very problem you are all bitching about; provisioning a ton of resources and getting a big bill. It's very easy to raise the cap.