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Suggested this a while ago. Was told normally there is so much disk included that this isn't necessary, which is true for managed VDS customers, and managed machine customers who choose HDD. Unfortunately 5/6 of my machines use SSD, and some of our servers have upwards of 30GB of maps D:
Yes but game files are only added once. If you have 5 CS:GO servers for example, additional space is only taken by custom files.
If you absolutely need a game install removed, you can open a ticket, but the minimum HDD space for a VDS is 400GB, and I have trouble hitting 160GB on my dedis which have more power.