Hacker News Daily 上看到的，美國聯邦政府的 CIO Clare Martorana 行文建議行政管理和預算局 (Office of Management and Budget) 安裝 ad block 軟體以確保資訊安全：「The NSA and CIA Use Ad Blockers Because Online Advertising Is So Dangerous」。行文的文件在「Wyden Letter to OMB on Ad-Blocking」這邊可以看到，另外在 Hacker News 上的討論「The NSA and CIA use ad blockers (vice.com)」也可以翻。
有很多惡意軟體 (像是 malware) 會透過合法的 ad network 散布，然後竊取資料，甚至是透過麥克風監聽環境音：
I write to urge the Office of Management and Budget (OMB) to protect federal networks from foreign spies and criminals who misuse online advertising for hacking and surveillance, by setting clear new rules for agencies in its forthcoming “zero trust” cybersecurity policy.
I have pushed successive administrations to respond more appropriately to surveillance threats, including from foreign governments and criminals exploiting online advertisingto hack federal systems. This includes seemingly innocuous online advertisements, which can be used to deliver ‘malware to phones and computers—often without requiring users to click anything. This ‘malware can steal, modify or wipe sensitive government data, or record conversations by remotely enabling a computers built-in microphone.
記得我是從 Firefox 還叫做 Phoenix 的時代就在用 ad blocker 了... 建議大家一定要裝啊，以現在來說應該都是裝 uBlock Origin，在有支援 extension 的瀏覽器都有商店可以直接安裝。