Is it illegal for a shareholder to arrange to delete another shareholder's text message?

Illegal. If a shareholder deletes another shareholder's short message without another shareholder's consent, it will violate another shareholder's right to privacy or freedom of communication, and it will violate relevant laws and regulations as the case may be. Therefore, when dealing with company affairs, shareholders should abide by laws and regulations and business ethics, respect the rights of others, and protect personal privacy and freedom of communication. If there is any dispute or controversy, seek the help and advice of legal professionals in time.