I am a very light wechat user, using it only for work to communicate with suppliers, yet my wechat constantly gets bloated, have had to clear it every month or so.
Below is an image with wechat consuming a large part of my internal storage.
Often people talk about the media taking most of the data, but this doesnt seem to add up with this image
Edit: The second ~13GB is also related to wechat, it is under com.tencent.mm/MicroMsg/xlog/...
After a app info -> clear storage it looks like this.