In my mind no they are not but that is just my personal opinion. I know as we all get very busy between working, taking care of children (getting them to practice, games, etc.) along with taking care of our aging parents it can be daunting to try and cook for our families. So, when these meal delivery services came out it seemed like quite the answer for a lot of people. And it might still be for you but just know there are risks and other options available as well. Other options would be to check with your local grocery stores to see if they offer online shopping as well. Pick one day a week where you can get some meal prep work done at home to ease the burden of cooking on those extra busy days.
First, I want to talk about the food safety of these meals. I often wondered how these meals were kept cold during transportation - especially those hot summer months. It appears (according to the article from the link below) this is indeed an issue. Due to not keeping (especially the meats) cold it does allow for microbial growth. How much growth varies in accordance with how cold the meat / food is kept.
Another pet peeve of mine is getting into a recurring monthly membership fee. I have not heard of any issues with people cancelling but just know that I tend to not use products all the time so I am not one to order this way. If I like a product well enough to use it routinely then I will order more of it in my time frame. If you are looking into these services be sure to ask about their cancellation policy - no hidden gems such as must be a member for a year before you can cancel, etc.
Therefore, my advice is to consider all options and figure out what is best for you. Couple key questions I would have for meal delivery services is what do they pack their products with - i.e. gel packs or dry ice and how long from time of packing to delivery? After all, knowledge is power and once you have armed yourself then you can make the best decision for you and your family.
Here again, this is my opinion of what works and does not work for me. I do not endorse nor do I renounce these services. I wish you the best in making your informed decision in regards to feeding yourself and your family!