By closing the site they are cutting off the only source of meaningful human contact for some. Sure, it is their site, but it means a lot to a lot of people. Some degree of responsibility is taken on because of this whether they like it or not.
This is exactly what I thought. Even though I know nothing about the site, I wondered how if they were genuine about supporting Autism, wouldn't they realise how distressing being cut off would be for those who use ithe site as a major source of interaction.
Skyblue, I feel sorry that from what you've said, it seems you have been taken advantage of. If nothing less, I'd be asking them for the money back.