How can you describe the relationship of the team and the owners of the tokens after the end of the token sale?

We have TAP. This is a mechanism which actually helps token-holders to control how much money is available to the team.
Also, making decisions isn’t the prerogative of a centralized team. The project funds are managed on the basis of a democratic voting system of the investors. Any change in the monthly financing of the project can be approved only by the owners of the tokens (50% of those who voted plus 1 vote). The team has no voting rights. So the opinion of the owners of the tokens is the main factor for the team.
Investors can always return some of their funds if the team don’t keep the promises. Therefore the investors get a relevant level of control over the project in which their funds are invested.