Gaining consent is crucial for several reasons. First, it helps you comply with various data protection regulations such as GDPR, CAN-SPAM Act, and CCPA. Failure to comply with these regulations can result in hefty fines. Second, it ensures that your email list consists of individuals who are genuinely interested in your content, thereby improving your open rates and click-through rates. Lastly, it builds trust with your audience, fostering a positive relationship between your brand and your subscribers.