Other live streaming competitors are not allowed to advertise on Twitch (ex: YouTube Live, Facebook Live, Discord, etc.)

This statement is true. Twitch's Community Guidelines and Terms of Service prohibit the promotion or advertisement of other live streaming platforms that directly compete with Twitch. This policy is in place to maintain Twitch's market position and prevent users from diverting their audience to rival services. While general social media links are often permitted, direct links or explicit promotion of platforms like YouTube Live, Facebook Live, or even Discord (when used for live streaming purposes) are typically considered violations. Violations can lead to content removal, temporary bans, or even permanent account suspension.