Im on a “pay as you go” contract so browsing lemmy or the internet in general can get expensive quickly, this isnt a problem for people who get unlimited data on a fixed plan. But those plans are too expensive for me and many other users.(around about £15ish a month.) If there was a mobile data mode for lemmy there would be downsides to the experience, such as lower picture quality, and the mild inconvenience of needing to click of an image before viewing. But i think that this is a needed feature for many users. (This applies to lemmy and lemmur.)