Unreliable both as a platform and as a plugin

My experience with MailerLite has been simply disastrous.
The problem does not concern only the WordPress plugin, but the entire platform.

After numerous attempts the result was always the same:
forms display a success message, but users are NOT added to any list.

This happens both from WordPress and directly from the MailerLite web interface.
A system that communicates “subscription successful” when the subscription has not actually occurred is, quite simply, unreliable.

The interface is confusing, the logic opaque, and the complete lack of meaningful error feedback makes it impossible to understand what is going wrong. For such a basic function as subscriber management, this is unacceptable.

After hours wasted on tests and checks, I uninstalled everything.
I cannot recommend MailerLite to anyone looking for a simple, transparent, and reliable tool.