What are the risks of using self-hosted open source tools?

There are great open-source educational tools out there. Someone with some IT skills can easily set up a server and host open-source tooling. However, you should be aware that there are some serious risks involved in using self-hosted software:
First, there is no guarantee for uptime of the tool. With self-hosted software, it is usually one person that is hosting and supporting the tool. What will happen if this person gets sick, or leaves the TU Delft for another job? What will happen when a tool goes offline, and this person has no time to fix it?
Secondly, installing a tool is not so difficult, but supporting the tool and servers is the tricky part. Is the tool installed in the best possible way? Who will update the tool, but also the servers? Who will monitor if the tool (or servers) has security issues? Who will make sure that the data is stored long enough (in some cases seven years) and in a safe and secure way?
Finally, who is responsible if something goes wrong? What will happen when the tool is hacked and there is a data breach? Who needs to act and report to the authority? Who needs to pay the fines?
To sum it all up: There are some serious privacy and security risks with using self-hosted tools. If you want to use self-hosted software, make sure to be aware of the risks it may cause you.