This is the most immediate and severe risk. The individuals who crack and redistribute these plugins do so for malicious purposes. In the vast majority of cases, they inject a hidden payload into the plugin files before offering them for download. This payload can be anything from a simple redirect to a sophisticated backdoor.
For e-commerce stores, the Pro plan ($399/year) includes cart abandonment detection and on-site retargeting. The ROI from recovering just 5 abandoned carts per month pays for the license twice over. Nulled Wordpress Optinmonster 2.