I think there would be a market, if people could write ios apps or answer message (like airdroid) on any operating system. But maybe as just an open source project.
I personally do not have must trust for social-media platforms. I would not trust that they would actually give me my money back.
Also, what is stopping me from spamming the site after I get my money back? like I can queue up accounts, wait for them to age up and just start spamming.