A few reasons (mostly financial):
The show isn’t exclusively made for the streaming service. It may be a co-production between, say, Netflix in the US and CBC in Canada. It’s easier to make a single version of the show that fits both markets.
The show was an acquisition from a traditional broadcaster with existing ad breaks. It’s easiest and cheapest just to cut out the gaps and leave the show structured as it is.
The show was made for the streaming service but with future sales to other markets in mind, probably international ones. These usually require ad breaks, so it’s easiest to bake them in now.
EDIT: That last case could include making it easy to insert adverts on the platform, as many others have commented. This is very plausible, but I just wanted to add that I’m yet to see it stated explicitly in any production guidelines.
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