Any my personal favorite is Windows Sandbox: a quick, one-click virtual machine that allows you to surf potentially sketchy web sites with little worry of something being surreptitiously downloaded in the background.

Source: https://www.pcworld.com/article/2136685/windows-11-licenses-plunge-to-nearly-half-off-for-black-friday.html

As he leaves, one of the tellers surreptitiously makes a phone call.

Source: https://tvline.com/2023/02/26/1923-finale-recap-season-1-episode-8-nothing-left-to-lose/

“Drip pricing” means a practice whereby elements of prices are not revealed upfront or are revealed surreptitiously within the user experience; and/or other such practices.

Source: https://www.dailyexcelsior.com/govt-seeks-public-comments-on-draft-guidelines-for-regulation-of-dark-patterns-on-online-platforms/

Eleven years ago, the U.S. Supreme Court ruled that police need a warrant before they surreptitiously slip a GPS tracking device onto someone’s car.

Source: https://chicago.suntimes.com/2023/2/21/23609167/automated-license-plate-readers-police-crime-privacy-editorial

“It is precisely because of the intrinsic relationship between the different phases that other themes cannot be surreptitiously introduced, thereby exploiting the assembly and disregarding the consultation of the people of God,” the letter said.

Source: https://www.catholicsun.org/2023/01/31/synod-focus-is-listening-to-spirit-not-debating-hot-topics-cardinals-say/

Lawsuit alleges that Apple concealed issues with batteries in certain iPhone models and "surreptitiously" installed a power management tool.

Source: https://www.gadgets360.com/mobiles/news/apple-usd-2-billion-lawsuit-london-throttling-millions-of-iphone-models-battery-issues-3998861

Not to mentioned, Dr. Albert Einstein, who, due to the security risk his celebrity posed, was not invited to New Mexico, but is rumored to have surreptitiously contributed when called upon – and many, many others.

Source: https://www.counterpunch.org/2023/08/14/the-elephant-in-the-boom-a-review-of-oppenheimer/