I can only speculate about the justification for these clauses. The contract was written by a group of 3rd-party lawyers who had little to none knowledge about

I can only speculate about the justification for these clauses. The contract was written by a group of 3rd-party lawyers who had little to none knowledge about the open-source community. My only guess is that they wanted the contributions to be tied to the company's name to increase their visibility, as in — "We [the company] contribute to X project(s); love us!" — putting myself in the shows of these lawyers, if an employee leaves, their contributions will stop being tied to the company and they will lose some visibility, that is the only reason I can think of right now. Your guess about "we pay you; credit is for us" also makes sense, they are the company's lawyers after all, they are not working to protect my rights but the company, so I didn't think too much about it when I signed, later I regretted my decision and quit.