Occasionally users may post download links that don't point to the official vendor website. The firmware could be unofficial or custom-made. For example, if you are familiar with Android, you probably heard of the CyanogenMod distribution, which is a popular community firmware based on Google Android along with plentiful gee-whiz custom code. One issue with unofficial firmware is that it may contain proprietary software not licensed for free distribution. Another issue is that installing such a firmware would likely void the warranty of your device.
Our take on this onwards is that you can link to firmware downloads, but you should be aware of potential licensing issues. We are not responsible for the content on any linked websites which are not under our control, nor should the inclusion of an external link be understood as an endorsement of that site. Last but not least remember that applying or using an unofficial firmware could void your warranty, brick your device or cause unintended head turns at your next high-school reunion, so proceed with caution.