I hope everyone within Skype used it as your main communication tool. If you did, the problem would have been so obvious. Not so long ago, it was revolutionary to be able to send messages to someone even when they were offline. However, once someone implements it every other chat app had very little time to do that. IMHO, there is nothing inherent about big companies from reacting quickly. It usually boils down to the culture of the company that's the cause. Call it "Bias for action" or "Ask forgiveness, not permission" or whatever you want to call it - a company (big or small) that allows people to go quickly fix an issue or try another solution instead of talking endlessly about it, well aware that there is a chance for failure, is the one that's likely to succeed.