Somehow a crazy person decided that I was cheating on Google's SERP using "hacked routers" (?) and started to make random queries to my "/search" endpoint, doze

Somehow a crazy person decided that I was cheating on Google's SERP using "hacked routers" (?) and started to make random queries to my "/search" endpoint, dozens of "POST newsletter/add" with fake emails per second, and other really lame attempts to get on my nerve and cause downtime.