What's the meaning of soft limit in webtask pricing page?

Hey, i read that on webtask pricing page ‘Up to 1 request/second (soft limit)’, what’s the maeaning of ‘soft limit’ here?

Thanks

The soft limit means that it is not enforced, however may be in the future. It would be prudent to not exceed this limit to prevent any loss of service should we enforce this in the future.