I have looked into this previously but is surprisingly not easy to come across. Perhaps when some sort of SAFE tipping / rewards is implemented it can be done in a way that deliberately addresses this gap, ie built in stats for publishing (and bragging).
The two I know best are flattr and patreon, also steem attempts this too. There are / was tipping bots on reddit and maybe voat does it too, I’m not sure.
But stats on any of this is hard to come by.
The read.cash concept is interesting because of the flow.
Most sites do a kind of track-your-activity then distribute-to-producers, mainly to reduce friction in the user experience.
read.cash seems to be switching this to track-your-activity then send-you-your-producer-payment-list which is cool because it keeps the power with the user but also puts more work on them, albeit minimal if that list interfaces straight into your wallet.
This ‘switching’ concept will be everywhere on SAFE, eg search will be more like downloading a user filter, moderation will be like downloading a user filter, rather than giving your data to a central service which does the filtering for you and sends back the results. The read.cash microtipping system is like downloading a payment filter, which is a pretty neat switch I reckon.