IP Grabbers such as grabify are generally harmless, however they can be used to intimidate less tech savvy users. This can easily be prevented by using a blocklist.
This blocklist should work with any DNS sinkhole like Pi-Hole and Adguard Home
To install this blocklist, simply add https://raw.githubusercontent.com/EsadCetiner/Grabify-Blocklist/main/blocklist.txt inside your Pi-Hole/Adguard Home.