GMO bananas are resistant to diseases decimating banana crops in Uganda, where it is a major food. The real problem with GMO crops is restrictions put on them by the vendor, who require repurchasing the seeds for each planting. Poorer farmers may not be able to afford the seeds.
These particular GMO bananas have been developed publicly and have no patent restrictions. However, once GMO crops are introduced to Uganda, other seeds may well be patented.
It seems to me the problem is the onerous restrictions put on GMO crops, not that they are GMO.