There is Zigbee, Z-Wave and Matter. These are all smart home standards that are fully local and devices will be able to be set up and used even when the company goes out of business. You are however limited to the things that are standardized.
If you want to go a step further, look for devices made for ESPHome or devices made by Shelly. Both have local APIs and are very hackable.
(disclosure: I am the president of the Open Home Foundation and ESPHome is one of our projects and I am also a board member of the Z-Wave alliance)
If you want to go a step further, look for devices made for ESPHome or devices made by Shelly. Both have local APIs and are very hackable.
(disclosure: I am the president of the Open Home Foundation and ESPHome is one of our projects and I am also a board member of the Z-Wave alliance)