Spinning up an instance is akin to setting a web server. There’s a lot of personal information that gets tied to ownership of both domain and the hardware itself. This data is publicly known for those who know where to look at. Without the typical layers of privacy that shield anonymous users in big corporate services. Mostly due do payment information, whether you rent hardware or selfhost using some DNS registry rental from an IP provider. You’re out in the open hosting CSAM. You’d have local security forces in your home within the week in most developed and developing world countries.
On top of that, your instance would be immediately defederated by all other instances. So you’d be the only one on the hook for that crime.