Is each house church a non-profit organization?
There is one main reason why a church might want to have a non-profit status; The church would want to offer a tax write-off for its donors. We don't see the need for a church to have a budget, bank account, or system of giving. Therefore, there is no reason to have a non-profit status.
Can each house church accept donations for tax purposes?
The only reason a church would be accepting donations should be for specific instances of charity. Although much giving is done individually, there may be times where the church wants to come together to support something specifically. Therefore, the giving is not to the church. The giving is to the individual or organization they are supporting. The house church has no ongoing expenses that need to be supported. This is a big reason why the house church is so reproducible and sustainable when it comes to finances.