Isn't that true of ANY company relying on some service from some other company? What makes you so sure that this alternative service is more likely to stay around than one of Googles?
The reason we think that Google EOLs so many more APIs than other companies is because Google itself is still around. Some other company's API wont be EOLd, instead they will just go out of business (or they will be bought by someone who will shut down the service).
Are you going to invest into a company that has such an API its bread-and-butter, forced by finances to continuously improve it, or into a company that has it as a shiny new toy and throws it into basket when something else becomes more shiny?
The reason we think that Google EOLs so many more APIs than other companies is because Google itself is still around. Some other company's API wont be EOLd, instead they will just go out of business (or they will be bought by someone who will shut down the service).