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It has been seen that Google is issuing warning signs regarding its sideloading apps and it is important that we work towards taking it seriously. Google seems to be repeatedly issuing strict warnings regarding the same.
The warnings seem to be issued in response to the issue of Huawei smartphones getting banned by the US government. Since the ban, Huawei might be looking out for some unofficial sources in order to download the missing Google apps.
This process is known by Google as 'sideloading'. Apps running on sideloading carry a high risk of threat to data. These types of apps run down a great risk of potentially hampering your online activity.
Hence, it is highly advisable to stick to official app stores and research while downloading apps.