Because chess.com is a business who needs money.
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No but I have a membership but it stops at 25 puzzles. I read the membership page and it says that you get unlimited puzzles with gold membership.....
Try "ask a question" from support. There are many trolls in the open forms.
I have gold membership but why doesn't it give me unlimited puzzles?
Gold memberships purchased before September 1st don't get unlimited puzzles. The new Gold plans have different features and pricing.
https://support.chess.com/article/4566-september-1st-plan-changes
If you look at the membership page it also has some information about it.

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