For some reason this reminds me of the debacle [0][1] where some site was accepting "tips" from users who wanted to support any GitHub project of their choosing. They did it without explicit opt-in of the project owners (Armin Ronacher in this case).

Quote [2]:

> But nevertheless i think tip4commit should be opt-in instead,

> because i consider the current tactic to be a very intrusive form of growth-hacking.

[0] https://github.com/tip4commit/tip4commit/issues/127

[1] https://news.ycombinator.com/item?id=8542969

[2] https://github.com/tip4commit/tip4commit/issues/127#issuecom...