Although this initiative has a multitude of advantages, you should also be aware that, like almost everything, it has a less beneficial part.
And the thing is, you will be sharing this platform with other eCommerce that is similar to yours and that, therefore, are your direct competition.
In this way, making the simile with a large shopping center, if you walk through it, you can find several stores in its aisles that sell the same type of products. This is where the negative point lies.
With which, your potential clients will be able to focus their attention on other brands of your competition, in addition to your own.