Moodiy does better than a short trial for many customers: it offers a Free Forever plan when your requirements fit that plan.
The current website describes the free plan as free for life for up to 50 users unless you stop using it for an extended period. You can use it to evaluate Moodle hosting, create a site, test core Moodle workflows, and decide whether you need a paid plan.
The free plan is still subject to plan limits and fair-use expectations. If you need more users, storage, custom plugins, custom infrastructure, or broader support, choose a paid plan.
For paid plans, review the refund policy before ordering. New paid orders may be refundable within the policy window, but paid subscriptions are annual and no pro-rata refund should be assumed.