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Pro Follows strict privacy rules
Because it is located in Germany, the company has to follow very strict rules regarding privacy.
Pro 100% free (at the moment)
The company earns (enough) money with affiliate links, therefore there is no need for a purchasable pro membership.
Con No export of bookmarks in any form
Con Uses affiliate links which can be seen as an invasion of privacy
Affiliate links are usually not only a way to earn money with advertisement, it mostly also includes generating user profiles which could be seen as a big privacy issue.