System matching customer requirements

Victoria,
it is unlikely that this sheet of strange questions will be answered here in one fell swoop, almost every one of which requires clarification of "what is meant."
Most likely, this is some kind of enterprise request from the client, so I will try to answer in essence.
I ask you to send a link to the client to this topic, and not to copy my answer.
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System boot requirements:
Peak number of users: 50,000.
Peak concurrent downloads: 2,000.
Peak Download: 1000MB/s.
Peak upload: 1000 MB / sec.
Answer: Yes, but for the most part it depends on the infrastructure on which OneBox will be deployed.
If the client wants "installation on their servers" - then most of these questions will be for him.
If the client wants "installation in our cloud" - then yes, we can provide such (although there will be not one server, but most likely 6-7).
Safety requirements:
User identification and authentication, scoring system (role-based access control, RBAC) = yes
Confidential storage and processing of data (ISO 27002) = yes, but we did not receive ISO 27002 certification. Hetzner Cloud provides this thing for us.
Storage and processing of financial data (part of PCI DSS control purposes) = yes
Personal Data Protection and Privacy (GDPR) = yes
Secure user activity logging system = yes
Protection against attacks and violations (for example, Bruteforce) = yes
DDoS protection system (Incapsula, Cloudflare traffic filtering system) = yes, cloudflare
Antivirus protection = no. We do not check the uploaded data to the system. There are no antiviruses on the servers. At the time of downloading the data, the responsibility is on the user and his PC, if there is an antivirus there, everything is fine.
Secure digital signature = yes, but with publicity that it is for Ukraine. For Russia, I don't know.
Project management section (everything is YES here, but settings and finishing by integrators are required).
flexible creation of Cal for offers, Application package; - yes, but only in the next version of OneBox OS
creation of application competition rules, grant application forms in design mode with the ability to create different (individual for each) application forms for different Grant Competitions from existing elements; = yes, integrator configuration required
personal online account of the applicant for communication with the Foundation; = yes
the process of technical selection, selection of experts, online and offline negotiations, approval by the Directorate and the Supervisory Board of the Fund, signing of the Grant Agreement, project monitoring, final reporting. = yes
personal online account of a specialist for communication with the Fund; = yes
the process of selecting experts, passing online training by an expert, obtaining a certificate, signing an agreement with the Fund; = yes
integration with plagiarism checking systems to protect the intellectual property rights for the project. = yes
The system must be accessible to a user with disabilities = no. More precisely, we do not know, so I write no. Few CRM/ERPs match this. To finish - of course you can, almost any whim for your money.