Discovery+ (play.discoveryplus.com): brightline.tv / litix.io scripts spam requests without backoff, causing sustained high CPU

### Please answer the following questions for yourself before submitting an issue

- [x] Filters were updated before reproducing an issue
- [x] I checked the [knowledge base](https://adguard.com/kb/) and found no answer
- [x] I checked to make sure that this issue has not already been filed

### AdGuard version

n/a

### Browser version

n/a

### OS version

n/a

### Traffic filtering

- [ ] yes, I do

### Ad Blocking

_No response_

### Privacy

_No response_

### Social

_No response_

### Annoyances

_No response_

### Security

_No response_

### Other

_No response_

### Language-specific

_No response_

### Which DNS server do you use?

DNS protection disabled

### DNS protocol

None

### Custom DNS

_No response_

### What Stealth Mode options do you have enabled?

_No response_

### Support ticket ID

_No response_

### Issue Details

https://www.reddit.com/r/uBlockOrigin/comments/1w22p91/discovery_playdiscoverypluscom_adtech_scripts/

### Expected Behavior

_No response_

### Actual Behavior

The problem: two ad-tech vendors' scripts — [brightline.tv](http://brightline.tv/) and [litix.io](http://litix.io/) — retry their requests continuously with no backoff, for as long as the tab stays open. Tens of thousands of requests over a session, tens of MB transferred. This was drawing over twice the pc's idle power.

### Screenshots

Screenshot 1

### Additional Information

Results:

CPU: 10%+ sustained → under 1%

Requests: tens of thousands over minutes → ~6 over 20 minutes

Also tested three configurations for comparison:

No blocker at all: moderate, rising CPU (2-4%)

Blocker on, without these filters: worst result — high CPU (8-10%)

Blocker on, with these filters: best result — under 1%