Usually today your data is fragmented across platforms (so damage is reduced) which have centralized authorities who can step in and fix bad actor issues.
> Anyone or anything that accesses data in a Solid Pod uses a unique ID, authenticated by a decentralized extension of OpenID Connect. Solid's access control system uses these IDs to determine whether a person or application has access to a resource in a Pod.
Of course, as a data owner, you could accidentally grant a bad actor access to your data, but presumably you can also revoke that access as well.
They need a way to handle situations when bad actors take over, because other solutions handle this with centralized authorities who step in and rectify the issue.
Are you talking about literally exploiting a bug and hacking the underlying service that is providing access to the pod?
In that case, it's a question of who owns and operates the pod. Solid is conceived as a set of standards that can be implemented by either individuals, or by companies on behalf of individuals. Think "data ownership as a service".
So you can still have centralized entities that implement the spec and provide support and other services for users, including dealing with security incidents.