I think Coinbase was absolutely crucial in changing the public opinion of "buying bitcoin is for criminals" and "you just get hacked and lose it all".
But some of it is based on Coinbase's actions against Bitcoin over the years. They've promoted and helped pump up a lot of s*t coins, including forks of Bitcoin. And they've done little to support or further the values Bitcoin was built on or core development.
Happy to have done business with Coinbase back in 2015..
Of course later on I looked for a better and cheaper exchange, but really, Coinbase helped Bitcoin grow as much as Bitcoin helped Coinbase grow...
Today Coinbase is just one of many faceless shitcoin casinos but they had their use, once upon a time...
Coinbase provides a regulated environment for trading crypto-currencies as well as on-off ramps to traditional finance. It's definitively a plus to have them around.