I think in this context, 'time killing' is for the author of the feature, not the client of the website. I.E it was done because it was fun and the author had

I think in this context, 'time killing' is for the author of the feature, not the client of the website. I.E it was done because it was fun and the author had some free time, not as a 'time-killer' for people visiting the website