I've been rather impressed by the accessibility of Tinkercad
Back in the day, I got a copy of a Blender book really tried to get into making 3D stuff. I bounced hard. Even other entry-level 3D software like SketchUp is really boggling to me.
In Tinkercad, most things just work the way I think they would. (One exception I just hit - if you cut a hole into a shape, it won't actually cut that hole unless the hole is the same color as the shape.) I'm sure the cost of this intuitiveness is that it does way less stuff that something like Blender (not even sure you can apply textures in this), but I'm fine with that. I just want to make 3D shapes and export them! Which I appear to be able to do.
It's actually for 3D printing. I've heard talk about making a simple 3D modeler for decades. It seems as though the motivation to fund that was low but since 3D printers cost a lot, it is worth paying to provide an actually simple 3D modeler to their users.