How about a law that states:
If a business profits from the personal data of its users, then it must back up their data for a duration (say 3 years after upload) and make that data available to them, even if it removes that data from public access due to terms of service (TOS) violations. Failure to do so would result in the business being dissolved, this clause would mainly be to protect stakeholders who go out of business and can't afford to maintain backups.
This would work similarly to how a bank must be FDIC insured to lend out its customer deposits. Data is money in the information age and needs similar protections, especially with the rise of AI and profits generated from derivative works. A business which refuses to follow this law would be unaccredited, meaning that Google would be unaccredited in this case, so probably nobody should be using their services.
IANAL, but personally I might extend this to work something like personally identifiable information (PII) laws, where all of the user's data is considered private, but part or all of it may be shared publicly under the TOS which the user agrees to. The sharing would be at the discretion of the business, but the data would always belong to the user under copyright law until proven otherwise. The process of proving copyright ownership would first require full sharing of the data back to the user under court discovery laws.
The crux of the matter is that we have laws preventing the sharing of PII, but to my knowledge we don't have laws that protect access to a user's own information. Which seems doubly odd since companies profit from that data. Holding a user's data for ransom so that a business can make money from it seems akin to extortion, although I can't find the exact word for it.
Maybe the California Consumer Privacy Act of (CCPA) or similar laws could be extended to protect access to one's own information?
https://oag.ca.gov/privacy/ccpa
https://www.neighborhoodindicators.org/sites/default/files/c... (pdf)
Apologies if what I'm suggesting already exists, in which case filing a lawsuit should be straightforward.