As for cases of supposedly unfair treatment of SMEs, no such case has ever been reported to me.
In my view, it would be a bad idea to use the size of a company as a criterion for the provision of a service such as that offered by the Trade commissioner service. If criteria must be set, they should reflect the fact that the company calling upon the service is financially healthy enough to have a reasonable chance of winning contracts internationally. In other words, it should be ready to export, it should have a business plan, resources and innovative solutions.
There are countries that do this. Australia, for example, works with our equivalent, the Australian Industry Association, in view of the preparation of export readiness reports. This is a test used to verify if the company is truly ready and if it has a solid enough financial footing to be competitive on the world stage, no matter what its size, whether it be a small, medium or a large business.
If there were one criterion to choose, it would be that the business by ready. If it is not, then it would have to be provided with adequate services in order for it to improve its competitiveness.