As long as he really isn't making money off of this scheme then why not, right?
It said he was donating proceeds "from Google ads" to charity. This is different from what people actually pay him, right?
Frankly, I've no objection to him making a profit.
It's not like he's convincing people that the rapture is coming. He's not responsible for their delusion (always assuming that they are deluded.) You can blame their church for that. He's providing a service, it's just not the one they think he's providing. Even if his own motives are cynical, he's at least giving them some peace of mind.