I don't know about mobile (I've only noticed a small banner on at the bottom of the page on WP), but it appears they're using the exact same style of banner tha

I don't know about mobile (I've only noticed a small banner on at the bottom of the page on WP), but it appears they're using the exact same style of banner that Wikimedia use? They even explicitly give thanks to Wikimedia in the footer of their fundraising banner. I think both services are great, so I don't really mind if either of them decide to optimize their conversion rates, just like any other startup would.