There is quite a range of different meal kit services. To subscribe means to take that service for a longer period. We (in Germany) have different services. Some of those services just provide a weekly box of vegetables, potatoes, etc. with recommendations for recipes. That is ok, but leaves you with the decision to take what you like according to your recipes or intuition. Those boxes contain almost no plastics, are being returned by next delivery to be reused and so their impact to ambient is reduced to transport (more or less). I would see that as a positive effect to urban living people. However, it means that you have to know about shelf life, apart from the fresh vegetables and spices you may need something else if you are not vegan and it is assumed that you have available common kitchen ingredients, like sugar, salt, pepper, curry, etc. But it is fine for people not having a garden, but knowing to cook.
They mainly provide fruits and vegetables of the season and less on demand. The advantage is that most products are from free field. The disadvantage is that deliveries frequently contain products you don't like and which finally are being wasted.
On the other hand there are other services that focus on just that meals for an evening, etc. ordered on demand. I do not think that people knowing to cook would use that service. But it could be an approach for people having no idea of cooking. They sometimes provide everything including a detailed recipe, but just in the amounts needed for that specific meal. This means they have small bags with sugar, salt, pepper, etc. and in worst case everything is delivered in a lot of plastics. TV tests showed that even such supplies in many cases expected that some things are available in kitchen, like the mentioned salt, pepper, sugar, oil, etc. If you don't have that you will suffer from that service and will never use it again, because if you have to go shopping anyway ....
Meal kits are under strong competition. There are people knowing to cook which in extreme cases order weekly boxes for organic products. Others order ready made meals. I assume that the market for meal kits to prepare the meal at home is small and will never reach a volume that allows economic figures with fresh products. Or the people learn to cook or they will not, but kits will not help them.