That's not true at all. Minecraft Bedrock Edition, Minecraft Dungeons, and Minecraft Legends are all available on both Playstation and Nintendo Switch. Bedrock Edition is available for Chromebooks. Dungeons and Legends are both on Steam and will run through Proton.
Bedrock Edition is not on Steam and unavailable on Linux and Mac. Dungeons and Legends aren't available on Mac. In a strange twist, Education Edition, which is just Bedrock Edition with classroom oriented features, is available for Mac though.
It's so much fun, I legitimately enjoyed it more than the last few Pokémon games. I haven't enjoyed a monster collecting game that much since Heart Gold and Soul Silver. Highly recommend it.