Some things to consider about Flattr: you have to install a web browser extension; the extension requires access to your full browsing history; it was bought by the parent company of Adblock Plus, Eyeo.
> With the Flattr button it was only possible to flattr creators that joined Flattr. The new extension does not use the button so it does not need to know if there is a signed up receiver or not for flattrs. So simply put, if there is an owner they gets your money, if not the flattrs become the statistics we need to convince the creators.
Yikes. Don't use this, they clearly don't care about privacy.
The extension keeps everything locally, only the information necessary to make payments is transferred. There is even a blacklist in place that prevents any information about sensitive sites (online banking, mail accounts, other adult content) from ever being stored.
Here is a blogpost about it: https://blog.flattr.net/2017/06/key-elements-of-the-new-flat...
Same goes for the association with Adblock Plus. Both of Adblock Plus and Flattr are aimed at fixing the basic monetization strategy used on the web. Adblock Plus does it by removing overly intrusive ads while leaving less annoying ones, whereas Flattr aims to replace ads entirely by just paying the sites you visit directly.