[voakbasda]

No one has made a successful micro-tipping solution, because regulations and entrenched interests (banks, payment processors) have too much control and assess per-transaction fees that dwarf the amounts that such a system would be designed send.

Aggregation of tips and payouts would help, but that requires network effects (achievable only at scale) to be viable. I believe this approach has been tried in recent years, but I am not sure where those efforts went.