There have been numerous complaints about Paypal
. And, a payment processor should be provided as an alternative (which doesn't screw its customers). However, Bitcoin has serious technical limitations (including, a limit of 21 mil currency units), which guarantees it will never be a practical currency, and that it will crash.
At the very least, Canonical should find a community focused / moral alternative to Paypal and replace it for those who want to donate using credit card.