If I release something free of restrictions to the world as a gift, that is my prerogative. And a third party’s actions don’t affect my ability to do whatever I want with the original code, nor the users of their product’s ability to do what they want with my code. And the idea of “property” here is pretty abstract. What is it you own when you purchase software? Certainly not everything. Probably not nothing. But there is a wide swath in between in which reasonable people can disagree.
If you are an intellectual property abolitionist, I doubt there is much I can say to change your mind.
It is much easier to buy one “hefty” physical machine and run ProxMox with virtual machines for servers than it is to run multiple Raspberry Pis. After living that life for years, I’m a ProxMox shill now. Backups are important (read the other comments), and ProxMox makes backup/restore easy. Because eventually you will fuck a server up beyond repair, you will lose data, and you will feel terrible about it. Learn from my mistakes.