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I know that they are accepting it if you do some research BUT why hiding it ??
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Why? Likely for the same reasons Mozilla removed bitcoin donation button. It distracted page viewers resulting in less donations.
https://fundraising.mozilla.org/bitcoin-donations-to-mozilla-17-days-in/We received numerous requests from donors that they wanted bitcoin featured right on our primary donation form. Given the volume of page views to that form (millions during the life of the campaign), I was concerned that adding any unnecessary text would distract donors and depress non-bitcoin conversions, the source of more than 99% of all our campaign revenue. So we decided to add Donate with Bitcoin text, and test whether it depressed conversion or not. Here is what that looked like: [...]
The test showed that revenue per visitor drops by about $0.07 USD. Here is the Optimizely graph showing a 7.5% reduction in revenue per visitor:[...]