As of 2017-02-24, I do have following dependencies on cloud-services. I am proud that I have a rather short list of cloud services I am using. You should think about your list as well.
I am a frequent user of Twitter. I enjoy the input stream from all kinds of people around the globe. The eco-system of Twitter accounts I am following does provide a huge source of information I would not get otherwise. And for an average Twitter account, I've got many followers.
The benefits of Twitter come with a drawback as well: some kind of addiction. Therefore, in 2017, I stopped using Twitter completely for a period of time.
Signs of Discontinuation: Twitter has a high chance of being discontinued in the far future. However, it's not likely that this is going to happen in the next years. Twitter depends on one single firm and it is a closed source cloud service.
They already upset me. My biggest pain point is that the download feature of my own Tweets stopped working a couple of years ago. I am able to press the «please send me my Tweets» button but I never receive a download URL via email. So they lock me out of my own data.
Damage When Discontinued: Twitter is handy. However, besides the loss of data, there are alternatives to broadcast short messages to a group of people.
Possible Alternatives: I tested other microblogging networks such as GNU social or identi.ca. They work fine but the majority of people are on Twitter. What a pity.
My plan is to switch to an alternative such as this blog before Twitter is discontinued.
I once used Bloglines and then Google Reader to summarize the RSS/Atom feeds I follow using my mobile reader GrazeRSS. With the end of Google Reader, GrazeRSS switched over to NewsBlur. Since I rely on GrazeRSS, I switched as well. Because of my large number of feeds, I am a paying customer of NewsBlur.
Signs of Discontinuation: Single, commercial one-person company. No sign of any end but it is inevitable.
Damage When Discontinued: I will have to migrate my feeds to a different service that works with GrazeRSS.
Possible Alternatives: Meanwhile, GrazeRSS also links to The Old Reader and Feedly which are the potential alternatives. As an alternative to GrazeRSS, I could switch to elfeed which is a promising solution for an Emacs-based workflow.
ChangeDetection is a handy cloud service that sends emails or provides an RSS feed when an arbitrary web page has changed. I prefer the RSS feed.
Many web sites do not provide RSS/Atom feeds on their own. Instead of periodically visiting a set of web pages to look for changes, this services pushes changes into my feed aggregator.
Signs of Discontinuation: So far no sign of discontinue. It's a commercial company offering a free-to-use service. Therefore, it will be discontinued some day.
Damage When Discontinued: I have to look for an alternative.
Possible Alternatives: To be done. Most likely something self-hosted.
This blog is using Disqus for comments.
Signs of Discontinuation:
They show signs of being not usable any more. So far, I did not have to change anything.
Damage When Discontinued: I am going to lose all my comments so far.
Possible Alternatives: To be done. Most preferable something self-hosted with a minimal technological stack (no DB, ...).
GitHub is the most important hosting service for source code. I do use it to host my source code repositories as well.
Signs of Discontinutation: So far there is no sign of a complete cut-off. However stuff like this is disturbing.
Damage When Discontinued: Since GitHub is using git which is a decentralized source code management system, no source code is lost. However, the history and current entries for issues are lost.
Possible Alternatives: Self-hosting git services or any other public git hosting service.
My favorite search engine is startpage.com. In contrast to Google Search, it respects and emphasizes my privacy while providing the same search result quality of Google Search.
All of my browsers are configured to use startpage as the default search engine.
Signs of Discontinuation: Nothing so far.
Damage When Discontinued: No big damage as long as there are alternatives.
Possible Alternatives: DuckDuckGo