Based on your keywords, you are referring to the major cybersecurity incident in 2017 and 2018 involving the software , developed by Piriform (acquired by Avast), which was investigated by CBI (in this context, likely referring to Czech Business Intelligence or a misattribution of the investigative bodies like Cisco Talos/Morphisec, as the Central Bureau of Investigation in India handles different cases).
Experts and long-term users generally agree that while it is effective for surface-level cleaning, its more advanced "optimization" features should be used with caution. cbi ccleaner piriform