The downside is your neighbours also having unlimited bandwidth. We had to rebuild one Citrix environment to a different (identical) box, because the first was in a network segment with terrible network performance.
If you pull a short straw, your box will be sharing bandwidth with a few bittorrent seed boxes or someone’s video CDN node
For anything bandwidth-sensitive that can’t be spread out across multiple nodes I’d shell out for the 10Gbit option which is still reasonably priced and still includes 20TB of free bandwidth.
Hetzner bare metal have unlimited bandwidth.