Why owning your data matters, and what it does not do.

The price only moves one way
Prices keep climbing, and you are increasingly paying for things you did not ask for. Major providers have raised business prices while bundling AI features into every plan with no way to opt out, which means you now pay more to have automated systems reading and processing your work.
What owning your data does, and what it does not
Here is the part most privacy companies will not say out loud.
Self-hosting does not make you subpoena-proof. Nothing does. If a court wants your records, a court can get your records, and any vendor who implies otherwise is selling you a story that will collapse at the worst possible moment.
What owning your data changes is who gets served, whether you find out, and how much is sitting there to take.
Today, if your email lives with a large provider, a demand for your records goes to that provider. They have a legal department whose job is to process it. They may be permitted, and sometimes required, to hand your records over without telling you, and in some cases they are barred from telling you at all. You find out afterwards, if you ever find out. You never got the chance to object.
If you hold your own mail and your own files, that demand has to come to you. You know about it. Your lawyer sees it. You can move to quash it, narrow it, or comply on your own terms. And because you are not keeping ten years of everything in an advertising company's cloud by default, there is far less sitting there to be taken in the first place.
That is a real difference, it is a material one, and it is one you can actually rely on. Which is more than can be said for a promise of immunity.
Surveillance is the business model
Underneath the convenience, the business model of most free and cheap tools is surveillance. Your activity and your data are the product being monetized. You are not the customer so much as the inventory. Owning your infrastructure is how you stop being inventory.

