Selling censorship resistance is a much easier sell than promising money for your posts. That's why I'm using Steem dapps myself - censorship resitance comes first, money second. So a very smart move by Partiko. You don't need to start explaining to people where the censorship resistance comes from, they just get it. With Steem payments nobody will get it even after you've talked about it at length.
On another note, how are they going to onboard all those users? Do they have some kind of solution in the works? I know some dapps are working on something and even some witnesses like @ura-soul has an account incubation project going on.