Hi @fayratta,
sorry for the late reply, I am rarely checking the reviews, I am checking the forum threads daily though.
Please note that the reCAPTCHA integration is the second line of defense only, we do have some simple anti-spam protection built into WPAdverts but it became inefficient lately as the spambots’ ability to fill the forms improved.
To resolve the problem for free users i released today a 1.5.5 update that addresses the spam submissions, you can check the blog post here https://wpadverts.com/doc/spam-submissions/, but in short, there are 2 features that will work in the background to catch the spam and one that you can configure.
BTW. Before the update, we also had some methods (other than reCAPTCHA) to stop the spam, for example, you could make the [adverts_add] shortcode available to registered users only or using the free plugins for stopping spam (now the free plugins are integrated into WPAdverts).
You can read more about it here https://wpadverts.com/doc/spam-submissions/ although i will be soon updating this article to reflect changes in version 1.5.5.