Anyone who has changed their IMEI No. themselves?

So I was bored and went down a rabbit hole and kind of found out how to change IMEI numbers. I have yet to test it out but before I do I wanted to ask that how come there's so few resources available for this? Considering the fact PTA tax affects us all shouldn't people not gatekeep this and help others out? From what I understood of CPID there's a website for that but it's definitely a paid process. Also if someone has done this themselves successfully any tips would be appreciated.