1. Special business model: As a grandmother, she has a unique business model and characteristics, which cannot be simply copied and added. They may pay attention to family traditions, handmade products and unique tastes, which need to be managed and controlled by their grandmother herself, and cannot be copied by joining.

2. Brand protection and control: Grandma attaches great importance to brand image and quality control. They hope to ensure the consistency and quality of products through their own direct stores or authorized stores to protect the brand's reputation. Open joining will bring risks in brand image and quality control, so we choose not to open joining.

3. Operational difficulties and risks: Franchise stores face some difficulties and risks, such as the ability of operators, management problems and market competition. Grandma thinks she can better control and manage direct stores to ensure stable operation and quality.

4. Brand development strategy: Grandma has her own brand development strategy, and they think that not joining at present is more in line with their development plans and goals. They pay more attention to brand influence and market share rather than expanding the number of franchise stores.