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Google tries to defend its Web Environment Integrity
(techreport.com)
This is a most excellent place for technology news and articles.
Checking whether the bootloader is locked or not, checking for abnormal system properties like whether the ROM is using release keys or test keys, and other methods that idk of, you can test momo which is an app that checks the environment and tells you if there is anything abnormal about it, some use it to check if they were successful at hiding root and anything abnormal