Would it be because the specificity of your initial posts makes them of limited interest (outside of the dev community) whereas the more generic "Make sure you stay safe people" posts have a global appeal?
Audience relevance and context drive upvotes?
Just a thought.
RE: Why did a post telling people to report bugs make 3,000 USD in upvotes and my actual post about a legitimate security issue that the developers directly thanked me get less than 100 USD?