As I said before, it's Essex Record Office that is charging, not Ancestry - if you're going to complain, at least choose the right target. I'm sure Ancestry would have been absolutely delighted to have had the registers on their site, as they do for other counties - but Essex probably didn't want to accept a cut in their income, even though it would benefit users. We're potentially faced with a similar situation in Suffolk - see my newsletter articles on the topic.
DeceasedOnline is a different situation because their records are transcribed and indexed at their own site, and always have been. They're a commercial business providing services to cemeteries and crematoria, as well as operating their own site for researchers. If researchers were able to access their records as part of their Ancestry subscription their business probably wouldn't be viable.
Fold3 is different again because it's a company that Ancestry took over, but decided to maintain as a separate site. You can buy an Ancestry subscription that includes Fold3, but Ancestry don't advertise it outside the US because most of Fold3's records are American.
It seems to me that the difference between us is that I've been a subscriber on and off to Essex Ancestors for the past 10 years, and have probably paid Essex Record Office about £500 in subscriptions during that time. Whereas you'll have the benefit of Ancestry's indexed transcriptions, so you'll save hundreds of hours and hundreds of pounds compared to me.
Aren't you the lucky one!