Why upload apk files here

Some devices do not come with Google Play installed by default, and on some of them you cannot even install it, so not all users have access to Google Play.
Our site gives authors and users more freedom because we don't do much moderation besides automated antivirus check.
Users are not limited on what they can download based on device version or country/location like it is on other stores.
By uploading on our site, authors can reach more users for their free / demo / commercial apps by making it available to other markets besides Google Play Store.