tests conducted by the AV-TEST Institute in August 2021, Avast and AVG received six out of six points for protection and usability, and six out of six points for performance. A review in Tom's Guide says that the free Avast antivirus product has "good protection against malware" and takes up little space on the system. The review says that Avast has a competitive set of features for a free antivirus product, but the scans are sometimes not very fast. The Avast antivirus product for business users received 4 out of 5 by TechRadar in 2017. The review said that the software had good features, protection, configuration and an "excellent interface", but it took up a lot of hard disk space and did not cover mobile devices. According to Tom's Guide, the mobile version is inexpensive and packed with features. PC Magazine said that the mobile version "has almost all the security features you could want." AVG has also generally performed well in lab tests. A review in Tom's Hardware gave the AVG software seven out of ten stars. The review highlighted that the software has a small system footprint and has good malware protection, but does not have a quick scan option and lacks many additional features. Collection and sale of user data In late 2019, Avast browser extensions were found to collect user data, including browsing behavior and history, and send it to a remote server. The discovery led to the extensions of the Avast and AVG brands being temporarily removed from the Google Chrome, Firefox and Opera extension stores, however, they returned a short time later as there was no concrete evidence that demonstrated a breach of private data of the users. In January 2020, a joint investigation by Motherboard and PCMag found that the Avast Antivirus and AVG AntiVirus Free version were collecting user data, which was being resold to personalize advertising through a subsidiary, Jumpshot. The leaked documents showed that Jumpshot offered to provide its customers with "Every search. Every click. On every site." from more than 100 million compromised devices. In response, Avast announced on January 30, 2020, that it would immediately shut down Jumpshot and cease all operations due to the backlash of its users' data privacy. On the basis of the information revealed, on 11 February 2020 the Czech Office for Personal Data Protection announced that it had initiated a preliminary investigation. See