harder in practice because many large instances block single user instances because abuse was an afterthought to the activitypub designers.

Also, if you want to operate a home server, you also have to be willing to have a public file upload endpoint capable of receiving and storing arbitrary data on your server (because that's how ActivityPub works), and people send your server a lot of data, and a lot of that data will be extremely unsavory, and it will be your responsibility to make sure you remove anything illegal that someone on another server uploads to yours.

I wasn't willing to take that risk, myself.