This is the danger in building a smart home with proprietary, cloud based based platforms. The users have no control over the platform, and and it can be pulled from under your feet at any moment.
To avoid this, it's better to choose an open, cloud free home automation platform such as Home Assistant. It's open source and can't be shut down or remotely disabled, and works with smart devices from almost any vendor, meaning you aren't locked into a single ecosystem. There is even an active Lemmy community at [email protected] to get advice and inspiration.