Open source software always has the advantage of offering a free alternative to mainstream solutions, but it doesn’t guarantee user adoption. Your end user – whether an individual or a business – will care about two main points:
1. Does the product do what it is supposed to do to make our life/business efficient/productive/easy/connected/fun etc.?
2. Does it feel right to use it?
Everything else comes afterwards. Even if there is a free open source alternative, people will often pay for the premium product if the open source one fails in either of the above points.