Limited access accounts are cheap alts used mainly for cheating. They use a traditional email and password, not requiring a client that supports them or a Forge/Fabric/feather alt manager mod. They're not cookie accounts. These accounts will work on vanilla or special clients Lunar or Badlion. While they're usually unbanned on most servers, these accounts are specifically checked to be banned and unusable on Hypixel and thus are sold at a discount.