Using things within a limit is always beneficial. Hence, the user cannot exploit the resources they have been allotted comes under the Fair Usage Policy. This policy makes sure that the user is using the resources to limit.
What "Unlimited" means?
In hosting environments, a server's resources are what economists would call a common pool resource, meaning that although having plenty of available system resources benefits everyone, no single user has an incentive to ensure that they don't use too many resources themselves.
Forums and any applications using a commenting system should have some form of spam protection or moderation. CAPTCHA is a popular way to eliminate spam robots from spamming your website.
Unlimited Disk Space/Bandwidth/Website Plans. This means that we do not set a limit on the amount of bandwidth, websites or disk space you may use in the normal operation of a personal or small business website, provided it complies with this Agreement. However, in the event your service usage or content presents a risk to the stability, performance or uptime of our servers, data storage, networking or other infrastructure, you may be required to upgrade to a VPS, or we may take action to restrict the resources your website is utilizing.
Search Engine Optimization (SEO) farms or similar are strictly forbidden on Youstable's servers and networks. SEO farms create undue strain and resource abuse on any given server and affect all clients.
Banner rotation services and link exchange networks are not permitted.
Offering Image, File, Document and Data storage, and free hosting and email services are strictly prohibited.
Off-site media storage is not permitted.
Operating a public mirror site is not permitted.
Running a proxy or anonymizer, whether publicly accessible or protected, is not permitted.
Prime bank or bank debenture-related sites, bitcoin sites, lottery sites, muds or online RPGs, hate sites, hacker-related sites, sites promoting illegal activity, IP scanner or other hacking tools, mail bombing or spam scripts, or forums and websites that distribute or promote warez content are expressly forbidden.
Bittorrent applications, trackers, and clients as well as any file-sharing/peer-to-peer activities are forbidden.
The operation of gaming servers (such as but not limited to Minecraft, Counter-Strike, Half-Life, battlefield1942) are forbidden.
Web spiders and indexers are not permitted.
The abovementioned services/web content create undue system load on our servers and should only be run in a dedicated server environment. All violations will be shut down immediately and may result in account suspension and/or termination.