I was also confused when I first found that page. The second sentence at top of the page, says:

    > [C]hoose the subscription plan most appropriate to your means — there is no difference between the subscriptions besides price.

So, you can pay just 4 USD or EUR per month to get full service. That seems like a steal.

About uptime, what level do you expect? If you Google for "Sourcehut uptime" you will find a bunch of pages with estimates. Example: https://sourcehut.org/blog/2020-07-03-how-we-monitor-our-ser...