Why does the speaker say "will use" not "use" here?
There isn't really a change in sentence nuance if the speaker says "will use" instead of "use" in this context. She is talking about a general observable pattern, so "will" can be used here as well to express this behavior. Ex: Sometimes, people will eat on the subway even though it's not allowed. = Sometimes, people eat on the subway even though it's not allowed.
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