I notice Stake uses Cloudflare. Of the 3-4 options out there I would choose Cloudflare over like-for-like competitors simply by virtue of research of reviews and ease of use. The Free Plan is basic. The Pro Plan is $20pm. The Business Plan is $200pm but guarantees 24/7 uptime in the event of a DDoS attack and finally Enterprise Plan which is Price on Asking. Are you at liberty to say which one is used by Stake? I have not heard of Stake suffering a DDoS attack so I would presume it is the Business Plan.
Stake as most gambling sites was under ddos attack at the beginning, as you may noticed site has changed whole backend to patch the weak spots and have better control over system abuse.