Do we need a blockchain to be decentralized?

I'm hosting a webinar conversation with Alex Hillman discussing the idea of decentralization and whether blockchain is really needed to achieve it. I'd love to hear the communities thoughts on questions to ask and things to discuss.

Alex Hillman is the co-founder of IndyHall- one of the earliest, longest running, and most respected coworking communities in the world. He's also an entrepreneur, developer, speaker, prolific writer, podcast host, and all around expert in building community. Despite having his reservations around blockchain and cryptocurrencies, Alex is a self-described fan of decentralization.

I always pay attention when smart people like Alex are skeptical. Should be a great convo, and would love to hear what y'all think. Here's the link for the webinar if you're interested!

https://www.crowdcast.io/e/do-we-need-a-blockchain