Are there professional grant writers?
For H2020 submissions in Europe, there are many companies specialized in improving a grant proposal, and managing administratively the project if it gets funded. Such projects have to have several partners (both academic and from industry) from several European countries in their consortium.

In particular, because H2020 requires (see this template) a chapter like Impact (on the European economy or society) on which academics are probably not the best to write about. Sometimes that chapter is written by industrial partners of the H2020 consortium.