Is mainstream adoption possible without CEX’s?

Genuine question.

For context I’m based in the UK. I feel like for a lot of the people who I know who are more the ‘mainstream’ side of crypto are heavily reliant on CEX’s like Binance, FTX and interestingly crypto dot com (which is incredibly popular here). I can’t tell you the amount of people who I’ve been talking about the FTX collapse generally in conversation and they had absolutely zero clue about it. They buy on sites like crypto dot com and they think it’s the exact same as buying on Vanguard, Hargreaves Lansdowne, Robin Hood etc.

Without these incredibly easy accessible services to buy and hold crypto in one place, will crypto get to the widespread mainstream adoption a lot of us hope for? Do CEX’s have a responsibility to educate consumers on the differences/importance of self custody wallets?

Satoshi wanted Bitcoin and crypto to be decentralised since inception. But I just don’t see a future of more peer to peer on blockchain. Feels like FTX is the justification that regulators have been looking for. Has the power of DEX’s and OTC gone too far? What’s next?