You are right. You have said what can be expressed clearly. These platforms and companies have decided to turn profit making into a kind of legalized exploitation. They take so much from every state and country but they give back almost nothing.
The part about eroding the tax is very real. We usually see this in underfunded schools or healthcare or pressure systems. Forcing companies to pay taxes locally will never destroy innovation you just make it more ethical and sustainable which I agree with. Things has to change.