[mnsc]

> All that data will then be nicely aggregated for a bad actor.

If I were to host my own backend for personal data on server/platform XYZ and there is a 0-day for platform XYZ, the bad actor need actively search out my server and get my data from my server. But a nicely structured datadump is not particularly valuable if it's just one person. So you need to hunt down all other instances of XYZ and aggregate all data to get something someone would like to pay for. But this aggregation is stale and when xyz is patched and months have passed you just have gigs of data that has gone bad, and just like rotten fruit that wont sell for much. So i would say, in practicality, given enough decentralization, and a lot of competing platforms, the hypothetical bad actor in this scenario is much worse off than the non-hypothetical bad actors we have running around and fucking with our data right now. FAANG et al.

[willemlabu]

You make a good point. PDS solutions aim to get rid of "big data", and centralised data lakes that can be queried. It's not inherently a bad idea, but:

> a nicely structured datadump is not particularly valuable if it's just one person

This very much depends on the person.

[fao_]

> But this aggregation is stale and when xyz is patched and months have passed you just have gigs of data that has gone bad, and just like rotten fruit that wont sell for much.

Not really. First off, I would imagine it would be possible to script finding people's servers and scraping it for data. Ultimately these servers will have to be hosted somewhere and systems like masscan make it easy to rapidly find servers hosting software that you can exploit. What's more, now the person is responsible for this risk level. Sure, a couple of experienced sysadmins like myself or you would know how to secure our data and make the server difficult to scan or probe, and difficult to access in the worst case, but how many users are actually going to be able to put in the time to learn system administration, to ensure that a server they are hosting is secure? It takes a lot of work, especially if you do not know the first thing about computers.

The end result of this will drive the introduction of businesses whose responsibility is to host these servers, and now you are back where you started, except worse! I can reasonably assume that just because my welfare data has been breached, that does not mean that they could access my medical records. Now however, that is not the case!

Secondly, even data that you would assume is stale, can be important and viable. Old phone numbers, for example, are still valuable as they can be used to construct a history for the given person, and often identity confirmation procedures require listing old information along with new information (A friend recently had to list places they had lived at to confirm their identity, which meant that they were unable to confirm because it was requesting a full list of addresses they had lived before they were ten (!)). Databases like Medical Records or your National Insurance Number do not tend to lose their value just because they aren't from this year data. Often old security questions and passwords are just as valuable as new ones, old information can be used to construct a 'good enough' profile and either used to sniff out newer more viable information, or used to aid the rapid generation of possible and likely passwords, among other things.

[mnsc]

Thanks! Very valid points, I left out all the nuances to get some counterpoints and yours are very valid. I think the biggest issue, as in most federated/decentralised scenarios, is the inevitable(?) backend/server hosting providers that will crop up. In this case there would be very large incentives to try to provide "easy solutions" that hide the technicalities allowing for loopholes to aggregate and sell data. The individual datapoints might be encrypted but you might monitor what kind of data consumers are attached to the PDS and based on how much activity the consumers generate aggregate and sell data about eg. users with many/active fitness related data consumers and target these users with ads about fitness equipment.

Disclaimer: I couldn't really grasp how Personium works from the "app screen demo" but it didn't stop me from commenting...