It looks like there is a problem with the default keyboard on some HTC smartphones as the keyboard has apparently stated showing adverts to some users.
The news was originally reported by GSM Arena who have now received a statement from HTC and it appears that this is an error.
Here is the official statement from HTC regarding the issue:
Due to an error, some HTC customers have reported seeing ads on their phone’s keyboard. This is absolutely not the experience we intended, and we’re working to immediately fix the error and remove the ads as quickly as possible.
As yet there are no details on when this issue with the HTC keyboard will be fixed, if you have had this problem on your device, leave a comment below and let us know.
Source GSM Arena