Accounts on ArrCay.com are available with tiered subscription plans. The general public is used to accounts on social media platforms being "free", so the system default is a free "starter" account - which is
very limited. Since I have no intention of selling user's data or otherwise violating users with corporate advertising plastered everywhere, the free account here really is free. Still, there has to be some way to cover the costs of server resources (and my time involved in managing them) because those things aren't free. So after getting familiar with the system, most accounts will [hopefully] want the increased account resource limits that come with a subscription.
It's your data; paying for the storage/network resources is a way to guarantee that it remains yours.
Subscription (and Managed Hosting) plans/pricing can be found here.
Account approval involves human interaction and may take several days. A related donation or subscription payment will result in faster account approval. ;-)