The reason why cold texting is illegal is because cold texting violates global privacy laws and regulations which include the ones set by the FCC or Federal Communications Commission and also the Telephone Consumer Protection ACT or TCPA in the United States.
Sending unsolicited text messages to people who haven't given their consent to receive marketing communications, essentially intrudes on their personal space.
Cold texting is when you send an SMS "text message" to a prospect or lead you to have no prior contact with them.
Cold texting follows the same principle as cold calling and cold emailing, reaching out to prospective customers you have not contacted before or have a relationship with via text messages.
Cold text messages are detrimental to business.
The cold texts take time to get through to your contact, which can potentially annoy them.
It can also waste your time and money, and above all, it is illegal in most countries, making you susceptible to heavy fines and damage to your reputation.