Raspberry Pi is actively preventing enthusiasts from upgrading soldered memory to a larger configuration even when the replacement chip is technically compatible. The company says the restriction is intended to discourage unofficial high-capacity resales.
The makers of both Orange Pi and Banana Pi have been around for years, over a decade at least for Orange Pi.
In fact in my experience SBC makers tend to be quite stable, possibly because those thinks are a lot more technically complex than, say, an electric kettle.