It's a constant uphill battle, but it seems the harder a platform is to use, the less likely it is to gather big crowd and thus the marketers. So perhaps an old

It's a constant uphill battle, but it seems the harder a platform is to use, the less likely it is to gather big crowd and thus the marketers. So perhaps an old style BBS, IRC , or a newsgroupserver, and a client built intentionally with bad UI