There is this remote camera app for baby cameras and home survelliance cameras, that all of a sudden started displaying ads in the application that lets you access the camera remotely.
Also these ads are full screen, unskippable 5-10 second ads that occasionally have sound as well.
Upon asking about this, the only reaction from them is a canned response telling about some discount, but there was no ad in the product before, they changed the deal afterwards.
Is this the new trend for companies to extract revenue from already sold products?
How is it legal to add ads into an already sold product afterwards?