I would guess they're also likely the first stop for new entrants, as they're (or were?) the only US based exchange, easiest to use, and insured by FDIC/Lloyd's

I would guess they're also likely the first stop for new entrants, as they're (or were?) the only US based exchange, easiest to use, and insured by FDIC/Lloyd's. Coinbase has been my recommendation to anyone new to the scene who wants to buy/use bitcoin. And obviously once finished, move all funds to paper wallet.