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Hello @nasikseva
You already wrote about this 3 years ago and you already know that the cloud service is paid.
This is not a stand-alone plugin, it is a plugin for working with a cloud service. CleanTalk is a plugin of free code that works with the Cloud Anti-Spam Service: https://en.wikipedia.org/wiki/Software_as_a_service
Other SaaS services may have some kind of free package, but in such cases it may have some limitations in functionality. In addition, their premium users pay for the work of all other free clients, since free users also consume the resources of this service.
Contact us if you need any help.