It's a bad thing. They're actively avoiding tax and hiding profits. It's not accidental and it's not all because they are reinvesting. They have decided that they shouldn't contribute to things that don't directly benefit them while using the tax payer built infrastructure and lobying to keep it that way. They're using this tax advantage to kill competition.

https://medium.com/bull-market/amazon-minimizes-profits-beca...

https://www.google.com/amp/s/amp.theguardian.com/technology/...