That's the thing about being an Internet startup... You never know when you're going to explode and suddenly jump from a ten-thousand-user service to a milliion-user service.
So supporting this would require a company to take all manner of new precautions that companies currently don't (circuit-breaker on the new account creation system? But then your growth stalls and your potential customers go to a competitor instead, and you don't blow up into a YouTube or a Twitter like YouTube and Twitter did).
Grace period - A grace period is a period immediately after the deadline for an obligation during which a late fee, or other action that would have been taken as a result of failing to meet the deadline, is waived provided that the obligation is satisfied during the grace period. In other words, it is a length of time during which rules or penalties are waived or deferred. Grace periods can range from a number of minutes to a number of days or longer, and can apply in situations including arrival at a job, paying a bill, or meeting a government or legal requirement.
In law, a grace period is a time period during which a particular rule exceptionally does not apply, or only partially applies.
