The Directive aims to prevent two widespread unfair business practices online, this does not mean that from now on reviews will be more trustworthy, unfortunately nothing a regulation can do about the lack of competence of those who issue them and actually little even about the abuses that will continue anyway, but now becoming clearly illegal. In reality such practices were still prosecutable, but with very long and complex investigations.
However, the control of infringements is not easy, not only by the authorities in charge, but also by Marketplaces such as Amazon where for some time a new practice has been underway by less-than-honest merchants to circumvent the regulations, simply by taking advantage of the possibility of putting two different products on sale in a single product sheet, as if they were a variant of color or size. In this way, the "good" and cheap product A takes positive reviews instead of the poor product B, exploiting a flaw in the Marketplace itself and misleading the customer, while still risking later being banned for life from Amazon.
The reviews thus obtained are in compliance with the Omnibus Directive being real purchases of product A, but not if the user believes they are referring to product B. Such a practice I hope will be banned by Amazon as soon as possible, but the system is not necessarily used on other ecommerce, and a similar system can safely be used even with "verified reviews" services being the check made on the automatic submission of order data to the service in use. Pure Marketplaces such as Ebay where positive Feedback from users is a very important metric, are not exempt from abuse, despite efforts to limit them and ban those who engage in malpractice.
Complying with the regulations is important in order to increase the quality of one's commercial offerings and transparency to one's customers; hardly any less than honest merchants, if not outright scammers, will find any obstacle in this legislation. Verifying that a review was really given by a real buyer and without any agreement of any kind requires very complex investigations, similarly to checking the price history, consequently, the agencies in charge will move as a result of reports and disputes.