Regarding Flattr - it does sound like a nice complementary system, but as a user I'm a little wary of using browser trackers to auto-generate flattrs. I prefer to know a little more directly of where money is going without having to manually change how I flattered someone. :/
As a creator type, it does seem like an easy way to get a little bit of change, but not enough to really replace anything like patreon.
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