These are keys ripped from public forums or trial extenders. They are shared by thousands of users simultaneously.
Many keys are region-specific (e.g., Turkey or Russia), meaning they will not activate unless you use a proxy or VPN, which can further complicate your security setup. Privacy Concerns:
If you cannot afford a paid Kaspersky license, you do not need to risk Telegram malware. Kaspersky itself offers safe, legal, free options: