[Gryphin]

Geo said it first, (and better) but since I prepared it:

Seems like it comes down to
Intent
Execution
If the recieving player keeps and uses the resources then it seems fair. Yes they can using the Trade Resources create a ship every two to four turns. If this were a specialty ship such as a warp opener / star buster / mine sweeper / cloked spy ship etc… it could have a impact on the game.
Perhaps the two sides need to reach an agreement on what the recieving player can and cannot do.
Some items for consideration are:
Intel
Research
Specialty Ships