Anyone. They are free to teach anything they choose and there's no one to correct them or out them.
That's why so many cults start as home churches. No one is paying attention to what they preach until they become big enough to be noticed, and by then it's too late.
I did, once, go to a home church a few times. It was ran by the brother of an old friend I had done street witnessing with in the past.
By the third visit I was so furious with what they were saying and doing I blew up and stormed out. Mind you I was about 16 and still knew things weren't right there.
I began telling people, Christian friends, what had happened there. A few months later my old friend, a grown man, another grown man and the one person I befriended there, who was a new Christian and didnt know anything, showed up at my door, at night, complaining I was talking bad about their home church. It was clear they were there to intimidate me to shut up.
The next time I called that new Christian I befriended, he told me the home church told him he was not allowed to have anything more to do with me. I could hear the struggle in his voice over this decision. He clearly didn't agree, but not knowing any better he did as he was told.
Now mind you when I spoke about the home church I didn't just go around saying they were bad, but I gave examples of my actual personal experiences and pretty much everyone drew their own conclusions. And every conclusion was negative against the home church.
They got away with this for years. No accountability. Until they convinced a 16 year old girl to run away from home and live with them. The reason? Her Christian parents didn't like what was going on at the church and wanted her to stop going. Not stop church, just that home church.
Obviously this lead to authorities stepping in and taking the girl back home. And the home church got put on a cult watch.
So in short this home church sent grown men to intimidate a 16 year old for sharing their experiences. Banned an adult man from talking to me, for the same reason. And got a 16 year old girl to run away from her Christian home because her parents didn't like the church. And that's just the stuff I knew about, which is little.
Also the old friend of mine had started going to my church. I hadn't been able to go as much, so he went a few weeks that I didn't know of.
After a few weeks he stood up during Sunday morning service, interrupting the whole thing, and claimed that a "prophetess", that remained nameless, told him that the pastor was stealing money from the church. I believe more was also said against him.
As a result the church literally split in half, and half of them quit.
Sadly most of the ones that quit were long time members. And not just long time members, but members who volunteered their time and talents to literally help build the church building. And I've no idea if he did this anywhere else, but I have to assume so.
No accountability for his actions or for the home church he was connected to.