Conan Exiles, that game that costs twice as much as Valheim, with $126 in DLC (that's another 6 Valheims), and purchasable season passes? That Conan Exiles?

Servers cost money to buy and maintain. Conan can offer dedicated servers because it can constantly attempt to drain its users for potentially unlimited amounts of cash with every piece of content it holds hostage.

Valheim is a singular purchase with no source of unlimited revenue. Since the company doesn't have a constant drain on its resources by providing and maintaining servers, it can avoid the need to endlessly fleece its customers.

In short; you're actively demanding that the devs screw over the community as a whole just so you can ignore running your own server for free. "This isn't rocket science man" just extremely bad naivety, ignorance, and laziness.