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GOODLUCK-HRMAdditional information (optional): -
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Just learned there's a issue with my ISP. Basically i can't do what i want if i don't pay. Perfect

I suppose running Bitcoin Core without port 8333 is useless for the network, is it?
You are right because running a Bitcoin core without port 8333 is useless for the network. 8333 is the default port of Bitcoin Core. All nodes in the Bitcoin core are used to communicate and collect data from the network. If any of the nodes here have a problem, it stops the connection of all the nodes. Tick the problem with your ISP. What you want cannot be done for free. Try changing the router settings and forwarding the port to 8333. Although port forwarding can put your computer at risk of hacking, do it cautiously and share it with an expert.
1. There's no problem using port other than 8333. Pieter Wuille (one of Bitcoin Core developer) already confirm it on
https://bitcoin.stackexchange.com/a/116717.
2. If there's problem with one of the connected node, Bitcoin Core would either disconnect or even ban it. It wouldn't stop connection to all other nodes.
This is the first time I have seen this kind of problem. I saw you here for the first time today. This has happened several times, which is likely due to a browser bug. You can clear the data and try again, and it will be resolved. If it is you still need to fix it, you can message support to find out what problem it is causing.
Another user already explain why this reply is technically wrong.
This is the first time I have seen this kind of problem.
This isn't a problem, it's just an extra feature/option provided by the browser OP is using. You get the same dialogue if you are using Chrome but without the option to disable JavaScript dialogues until the next browser launch.
This has happened several times, which is likely due to a browser bug.
Several times? Where? Can you please show us? And, how can a bug create a checkbox followed by a logical question in a dialogue box?

You can clear the data and try again, and it will be resolved.
As I said above, it's not a problem that needs to be solved, it is just an extra option provided by the browser being used, probably, and clearing the data won't make a difference here.
If it is you still need to fix it, you can message support to find out what problem it is causing.

But my question is what was that OTP for? And where can I get this OTP? What does it do?
You have made a good point and asked about OTP in the right thread for a solution. OTP is a system code that allows us to log in to our accounts securely. Using this, we log accounts securely. OTP stands for
Short-Time Password and is usually used to confirm the correct identity of the user. OTP system is used to secure the account. The OTP is generally sent via SMS, e-mail, or a particular OTP generator application. Account users confirm their identity by entering the OTP received within the specified period and using their account securely.
Follow It.
1. OTP usually stands for One Time Password. In addition, acronym for Short-Time Password should be STP rather than OTP.
2. If you read whole thread, @GIF-JOBS ask about OTP on Bitcointalk. Last time i checked, Bitcointalk only use application based for it's OTP. So there's no need to mention SMS or email.