Android's default Messages app is rolling out built-in spam protection
Built-in protection against spam is arriving in the stock Android messaging app gradually as of today.
According to Google's official support page for the feature, if a user reports a message as spam, "Spam reports include a copy of the spammer's messages (up to 10) and go to Google so Messages can better detect future spam for you." This feature is opt-out by default, and can be accessed by going to the Advanced section of the Android Messages settings menu.
Google did not provide any concrete plans for the rollout of this integrated spam protection, but did state that the feature is only currently being gradually rolled out in select countries, with a wider release planned "in the coming months."