All valid concerns, and I'll tell you that we take reliability very seriously. We have been in business, as ohdontforget.com, for over 4 years, and have learned a lot in that time.
We are not abusing e-mail or web interfaces. We spent months getting contracts set up so we could access the same data that major cell carriers use to route their text messages.
For one cent a message, give it a try, I think your concerns will be remedied :)
The problem Penny SMS solves is, without knowing the carrier, it is very hard to figure out where to route the messages to, since someone may have switched cell carriers, even multiple times, but retained the same cell number.
I wanted to use the press mentions for ODF, since it's the exact same technology, which is why I mentioned "The PENNY SMS technology has been featured on"
I realize this as a potential problem.. but then again, who would look for random events and rsvp to them... besides the slew of Techcrunch commenters that spammed the event mentioned in the TC article with javascript hacks :) (which are now being detected and disabled)
Bot spam is a different creature, and I have some measures to prevent against it, with more coming soon.
I wonder if there's a way to not let Google index it? Something about the robots file maybe?