Add a paid version for a few $ that gets rid of nags and mentions of Wikiwand.
I enjoy the interface of Wikiwand, but all the nagging and advertising going on really detracts from using Wikipedia. I wouldn't mind paying $3-5 to enjoy a "pure" version of Wikiwand that makes no mention of Wikiwand anywhere but the URL/logo.
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Asahiko Matsuda commented
I would pay if it removes even the Wikiwand logo. The logo distracts from reading the content.