My advice is not given in an attempt to control, but rather to educate and frame things in the correct context. There are many perfectly legal (under the definition of the law) reasons to send spoofed CLID information just as there many ways to use a gun that are well within the law. Some people however refuse to take responsibility for their own actions with knowledge.
In my message I provided some very basic resources that one can use to build their own FireRTC-like system to allow them to spoof phone numbers, what they do with it is their own responsibility.
You can google many many things to do but google is not responsible for your actions lust because they led you to the information.