By "requires running a server", do you mean that it requires you personally to run a server, or that it requires the seller of the solution to run a server? As

By "requires running a server", do you mean that it requires you personally to run a server, or that it requires the seller of the solution to run a server? Asking because those are two very different costs to me. For the former, it means that there is time and money investment in running the server, but that my continued use is only limited by my willingness to keep the server up. For the latter, it means that the solution may be end-of-lifed at any time, and I have no control over when that happens.