- What benefit does this give to the researchers who are publishing the data?
- Who is paying for storing the data - frequently in the TB?
When the answers are "approximately none", and "the researchers" you're not going to get many takers.
And that's assuming it's easy, it reality it often won't be. If there's a lot of data, it's literally just a pain to upload it (network bandwidth). If there's sensitive data (PII), it's a pain to redact it and make sure you aren't leaking any. Data is frequently in strange formats, and it's a pain to translate it to a standard one. Etc.
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I've worked with 3 university labs as a contract programmer. In all of them I worked with data with one of the issues mentioned above. Health information in one, TBs of photonics data in another (which was being parsed by extremely janky code too), and 4 16-bit channel images in the last (hundreds of GB of them too). Admittedly for the last it would have been easy to upload it as long as you didn't want people to be able to actually view it (on the other hand I wrote some software to let people false color them live in a browser for the lab, so that the researchers could view them).