They've not grown without challenges but they've been fairly transparent about it all.
I don't know. The thing about not having sufficient customer support is that Coinbase has been this way for quite a while now. It would be pretty easy for a company raking in 1.5% fees on their transactions to hire enough staff to respond to support requests.
Unless they say "we don't have the money because of this reason" or "we don't care about you, you losers", I wouldn't call them all that transparent.
They also haven't activated SegWit in ages and have been very vague about their progress in implementing it.
Anyone else want to share a positive experience about Coinbase?
It's good that they fought the IRS for so long, and it's good that they have a generally user-friendly platform to deal with.