Why would I want to stop them making it available as a network service except as a way of circumventing the copyleft by effectively distributing it without actually distributing it (which AIUI the AGPL fixes)? If you want to place restrictions on how people are allowed to use the software then A) I don't see the relevance of AWS as a special case, and B) go ahead but don't imply the "open source crowd" are being unreasonable by not considering it open source.