If you don't own Minecraft: Java Edition, there's a message that tells you to buy the game if you want to access it, along with a "Learn more" button, but clicking it leads to an nonexisting page on Minecraft Help.
(Here's the page the launcher leads to, how it looked like (using archive.org), and an existing page in the Help site that looks the same)
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Thank you for your report!
Closing as Cannot Reproduce.
Message is no longer in use.
Please note, that mechanics of the game may change between updates.
Things such as graphics, sounds, world creation, biomes, redstone, villagers, and animals may not work the same in current versions.
Full Version History – Feature Requests and Suggestions
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📓 Bug Tracker Guidelines – 📧 Mojang Support
📓 Project Summary – ✍️ Feedback and Suggestions – 📖 Game Wiki
Is this still an issue for you in the newest Launcher update? That message seems to have been changed a day or two ago.