Throughput on these "cheap" VPS providers is atrocious. I have 1Gbe into my home and none of the VPS providers can break more than a few hundred mbps, except for Cloudflare. The other issue is consistency, speeds fluctuate all over the map with these cheap VPS providers - even the big one like Vultr, Linode, and Hetzner aren't much better.
Also, WAF is now free with Cloudflare, so using a solution like this really doesn't make much sense, unless you're serving non-http content.
PSA: saying "I run Nextcloud and don't have any problems" doesn't help anyone or contribute anything useful to the conversation. It just makes you look like an insecure fanboy.