An iframe is an HTML tag that makes it possible to embed a webpage into another webpage. This means that Godot web games hosted on Gotm can currently be embedded into other sites without permission and be claimed original.
There are ways to detect when this happens and simply lock the iframed content from being shown correctly. However, this would prevent developers to show their own Godot web games in their portfolios and similar use cases.
The solution is to add a per-game option to disable iframing and also a an option to white-list specific sites to allow them to iframe the game.