Yeah, silencer, there are plenty of dissatisfied backers and they have certainly been vocal.
Here's an excerpt from an article
at Eurogamer where Julian addresses the subject:
Gollop apologised to upset backers.
"For those backers who are upset by our switch of delivery platform, we are truly sorry," he said.
"It was not our intention to scam anyone. The best we can do is offer compensation in the form of free extra content, which we will deliver throughout the launch year. This will include at least three major DLC packs. They will also receive a Steam key or GOG key, in addition to their Epic key, at the end of the exclusivity period. If they are not happy with this, we will give a full refund."
It's at least a modicum of compensation. Beyond that, let's face it, money talks and Epic is doing what it needs to do to make its store increasingly appealing to both developers and potential customers.