Attracta is not a scam. They are legitimate enough to have been included in cpanel, which would not partner with any fly by night service and provide that to a large portion of the hosting industry. Any modification to a website can and does often cause ranking issues, and while it can and is sometimes caused by SEO utilities, that is not cause to slander them for the failure. Is Chevy a scam just because most vehicles returned under various lemon laws have been manufactured by GMC?
If you already have a highly ranked site, you should consider any modifications very carefully. The cpanel plugin for attracta is mostly geared towards wordpress, although tends to integrate well enough with most php based applications.
Google is always implementing new ways to thwart SEO companies. Attracta, just like any SEO provider, does their best to keep up with undocumented adjustments to the algorithms to keep their customers rankings high, but like any 'one size fits all' solution, there will be misses. However, they obviously would prefer constructive feedback for both their free and fee based services from users so as to maintain the quality and value of their products.
If you advise them directly about the issue, I'm sure they would be happy to work with you to resolve the problem and improve their product.