The world today is full of do-it-yourself services. From putting up an ad to rent your flat, publishing your blog, to advertising on Google. Most of these are not very intuitive, and some have a high learning curve.
A marketplace or service of assistants that specialize in specific platforms and can help you do what is needed. Since they are specialists, they already know everything about the particular platform or service you need to use (register, advertise, etc.) So not only will you have a quick and easy way to do what would have been long and frustrating, but you will also learn how to do it, as they do it with you.