They could perfect it in house and then roll it out as a product. The way people type and use a mouse are pretty identifying especially when coupled with other things.

I do agree screenshots themselves are less useful for that.

That doesn't make any sense.

1. Why use their employee's data to fingerprint input? They could do that to a billion+ of their users instead.

2. Input fingerprinting is multi-decades old science, there are already production products that do this.

Are there products that do this with all of the other metadata that meta now collects? At the scale that meta collects them? My guess is no.

I would be highly surprised if they don't do this already for bot detection... but again, if they want to do it to track people on the internet, the data that would be useful is data from the internet, which they have an incredible wealth of -- not a dataset that is several orders of magnitude smaller from their internal employees' desktops.