In simple terms using your example, if the reseller has 162 accounts in cpanel, it would be R3.50 * 162 = R567 p/m as an additional cost. With a reseller who is already paying R499 per month, simply increasing their cost to R1066 is not an ideal solution in my opinion. We evaluating various options at the moment (PR generic responsive for now

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I see Cloudbric is much to same as Cloudflare, cWatch, Sitelock and other CDN / WAF / Scanning service and we test these services regularly on our side
Disclaimer: This is my opinion based on the research and testing we have done and do constantly.
A WAF is simply mod_security with rulesets, it can be implemented locally on a web server and perform the same tasks as these service providers (which is what we do). In most cases we have found their rulesets to be lacking (Cloudbric only has 26 preset rules), this however differs between providers.
We have found services like this to actually make fast websites, slower (unless you already have a very slow website or hosting provider).
If a web server is setup correctly, you have the right caching and it's serving pages quickly, these services will not increase the speed of the site, but rather slow it down. There are plenty of articles on the internet regarding this.
If however you website is not only serving the local market, but also the international market, then a CDN service like this makes sense.
The DDoS protection aspect of these services are sometimes hit or miss.
There are enough tools on the internet to determine the actual web servers IP behind a reverse proxy like cloudflare, cloudbric etc. (a simple example, look up the mail.<domain> record as most people host their email on the same server as their website).
In a proper, orchestrated DDoS attack, they will bypass these services and attack the web server directly. If they can't get to that, they will aim for the router / firewall in front of the web server. Keep in mind, a lot of these service providers will also only mitigate an attack up to a certain volume or period of time.
The only real solution we have found to this is using DDoS scrubbing centers around the world using BGP via a GRE tunnel. This involves monitoring for DDoS attacks, when they occur, advertise the /24 to the scrubbing centers around the world, forcing the DDoS traffic to the IP range to go to the closest scrubbing center, get cleaned and sent back to the hosting provider via the GRE tunnel. Guys like Imperva offer this service.
In saying the above, If you find one of these WAF/CDN solutions work for you and speed up your website, then great, stick with it. I would prefer Cloudflare over Cloudbric, but that's a personal opinion.
This post is completely off topic