That information was actually added to Steam a while ago. There's a gold box to the right of the store page under the compatibility section that says what third party DRM a game uses as well as if it requires agreeing to a EULA.
I'd also recommend the SteamDB browser extension if you want more information while browsing the store. It adds a ton of features such as displaying when a game was last updated, historical pricing, automatically skipping the age gate page, and a bunch more.
Luckily, thanks to Denuvo's bullshit licensing fees you can usually assume it'll be removed after a year (assuming the developer is still putting out updates).