Answer: Your guess is right
Explanation: Other reactions release energy, so forming sucrose from glucose and fructose is endoergic. Also a water molecule is formed.
When two molecules form new molecule, order is increased and energy is needed that. IT could also possible to use standard energies of formation.
It should continue to be restricted. If it is not restricted, there is a chance it will become extinct. This not only has bad consequences for us, it destroys the food web as a trophic level is effectively eliminated.