Allegations are just allegations until they're proven, but these complaints are actually very believable and not at all far from what usually happens with embattled exchanges. I never thought of Coinbase as being particularly safe, but I only usually hear about them being a shitty exchange, not a scammy one. Turns out everyone has plenty of scam allegations. I hope these are resolved as soon as possible.
This is just another reminder to not trust exchanges with your money and to not use them any more than necessary.