Go ahead and run the node ! If you want save disk space run it with -prune switch
Take note that blocks will not be relayed to peers, only transactions.
You don't need an unmetered connection. My full node on a dedicated server took up 200GB in one month with the synchronizing included. You can always limit it with the number of peers.
200GB in addition to other stuff you are doing may get you in trouble with certain providers fair use policies in some countries.
Some providers are quite strict about this type of stuff and may even start limiting your speed if you use way more than the avarage user.