You could have been quoting a little more from that news.

“Cryptocurrencies are extremely risky investments that have only been gaining popularity among retail investors particularly in recent times, and I do not think we should be endorsing their use in this way. In accepting them, I believe we are mainstreaming the usage of “investments” and technology that are inherently predatory,” the proposal read.

Although I find this overly harsh words against crypto (yet another naysayer), the actual points are clear:
* Wiki seems to have received very few donations in crypto (which is normal, since very small % of world population uses crypto, so it's imho not a valid problem)
* Wiki doesn't want to look like they would be endorsing cryptocurrencies, which actually I cannot argue

However, seeing Wiki as a pretty "hungry" organization - they do put big banners begging for money now and then - I think that's a losing move on their side. Although they've received "only" 130k worth of crypto as donations, it's much better than nothing.