Why should it be easy to start with?

Hardly anything is given for free in this life, it has to be earned.

Let me clarify.

You need an OS, you need compiler, you need some libraries.

Unless you write all that by yourself you always build in somebodies kingdom.

Indeed, however all of those have a license that most certainly was abied for, at least if we are speaking about doing the right thing.

Many of these "building castles in other people kingdoms" projects, tend to use free tier WebAPIs, forked projects, reversed engineered protocols, and then folks get entitled when the owners pull the carpet.

Do not forget the hardware. And having the means of creating said hardware.