Running Ethereum Light nodes

I had an old raspberry pi lying about and came across an article regarding light nodes on the ethereum network.

After spending many hours of troubleshooting and securing my pi, I've finally setup a light node on the network!

I have yet to actually know what I can do with it (I have googled but not in depth) and wondered if anyone here runs a lightnode or similar just for fun?

What have you done with it besides let it tick over and do it's thing?