I've made this meme regarding the purchase problem
The Sims FreePlay has started showing a dialog asking you to purchase currency when the game is started, usually this happens when the deal expires or something. FreePlay also does this if you don't have enough Simoleons, Lifestyle Points, or Social Points to purchase the object.
This is bad because people might not know that this actually costs real money and compounded by the fact that in-app purchases are enabled by default makes this matter worse. This can be a problem for kids or people unfamiliar with micro transactions. The only saving grace is the purple Purchase button and the prompt to enter your password.
None of the other games such as The Sims 3 and The Sims 4 attempt to ask you to spend real money although TS3 by default has Store items in Gold in Buy/Build Mode that costs SimPoints in addition to in-game items while The Sims 4 has added the DLC button although the game doesn't attempt to ask you to spend real money. Fortunately you can turn this off so TS3 only displays the in-game objects .
Origin ID: GothicSimmer, YouTube: GothicSimmer