I worked with this system. I needed to promote Instagram. Many features work great, but some were not used at all. The platform is paid, and there are various plans where you can check the terms and, if desired, purchase something for an additional fee. It's clear that with a large audience, you can't interact with everyone, so you have to use the automatic unsubscribe feature. The auto-posting function also works. Setting up the service is very simple, and no additional software is required. The service has proven to be reliable; they have been around for quite a while.
