My tiny personal web servers can whistand thousands of requests per second, barely breaking a sweat. As a result, none of the bots or scrapers are causing any issue.
"The only thing that had immediate effect was sudo iptables -I INPUT -s 47.79.0.0/16 -j DROP" Well, by blocking an entire /16 range, it is this type of overzealous action that contributes to making the internet experience a bit more mediocre. This is the same thinking that lead me to, for example, not being able to browse homedepot.com from Europe. I am long-term traveling in Europe and like to frequent DIY websites with people posting links to homedepot, but no someone at HD decided that European IPs couldn't access their site, so I and millions of others are locked out. The /16 is an Alibaba AS, and you make the assumption that most of it is malicious, but in reality you don't know. Fix your software, don't blindly block.