They want to run the staking system that ETH currently does. Give us your assets (in Fidelity et al’s case it’s not even the actual asset, just paper claims to it) so they can siphon off fiat fees and leave you with no actual assets. It’s the exact same scam just dressed up with a euphemism like “exposure” to Bitcoin. Sadly, I see this type of “adoption” as a major setback for Bitcoin; not a good thing.