Do World wide web Service Providers or Internet Cafes have the capability to constrict or control download speeds?

Well, not exactly. World wide web Service Provider, though, has the capability to manage the throughput of your speed. It is actually integrated on the DSLAM on its central office. That depends on what speed that you are provisioned for. That is why there are different speed packages offered by ISP.

For world wide web cafe, there's a software that would grant to control the download speed, thus, the answer is yes.

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Answer:
not in the Philippines at least. you might think it's that way because you're getting a slow download speed but chances are you haven't considered the architecture of your connection. (DSL vs Cable)

there are just good downloading days when the connection speed even exceeds what you paid for and absolutely pathetic downloading days when you feel like you’ve dial-up.

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Answer:
ISP, yes. World wide web Cafes, no as they’re also end users.