You are thinking small, seed or maybe round A. Rounds B and C funding is what you need to scale up a company to Dropbox or Twitter level of infrastructure. That can easily be 150-450m.
Granted not all of companies would need that kind of investment, but every once in a while...
Thanks - just thinking on the message handling front:
432 councils in UK, handling 22m households with avg 120 interactions per year : ~2bn transactions or 40m per council per year. As a shared infrastructure that's on the order of 40m per day. It's big - yes I could see how you could spend 100M usd, but that shared infrastructure approach is a big leap of trust - put it this way, Kent the council I live in is spending 40m on shared Citrix and shared firewalling for police, councils, fire etc in the area.
I just think we could do the next layer up a lot cheaper
Granted not all of companies would need that kind of investment, but every once in a while...