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The Basic list is a smaller, less comprehensive variant of the full list, which focussus mainly on Ads, (Mobile) App Ads

The Full list blocks: Ads, (Mobile) App Ads, Phishing, Malvertising, Malware, Spyware, Ransomware, CryptoJacking, Scam ... Telemetry/Analytics/Tracking (Where not needed for proper functionality)

Use the full list only if your adblocker can handle it (due to it's size).

The Full list already blocks all the domains Basic does, thus when using the Full list, it's useless to also add Basic.
Syntax. Unfortunately not all adblockers handle the same syntax, so choose the one that's right for you.
No. If anything, abp.oisd.nl blocks more, since it also blocks subdomains by default.

This is also one of the main reasons I recommend using Adguard Home (with https://abp.oisd.nl) instead of Pi-hole (or any software that only works with the "domains" or "hosts" -syntax)
The quick answer is; At least once every 24 hours.

It really depends on if there are changes in the source lists, and when false positives get removed from the oisd list.
A good guess from me would be:

oisd full: at least once every 24 hours
oisd basic: updated daily, but don't be surprised if there are some days it's not
oisd extra: updated only when a domain get's removed from oisd full that's listed in the default lists from either Pi-hole or Adguard (Those will get added to extra)
Quite possibly
I stopped manually adding domains as it is too time consuming, however;
- You can however create your own list, and pass me a link to it. I might just add it to the list of inclusions. Or;
- Contact any of the included lists and have them include it. Once they include it should get included in oisd as well.
Good chance the ads are being served from the same domain as the good content. A domain blocklist cannot block the ads without blocking the good content as well.
No. With the amount of lists included, that's near impossible.
The reasons for removal are also often not in line with the original blocklist.
False postives are also publicly viewable per-list on the 'included lists'-page.
When using this list in browser add-on blockers (eg. uBlock Origin, Safari Filters);
Yes definitely, as this is not meant to be a replacement for it's default lists.

When using this list in network based DNS blockers (eg Pi-hole, Adguard Home); I'd day NO

Where the default lists are known to break stuff (shopping referral links, google shopping, video playback, etc), the whole idea of this blocklist is to have ZERO breakage, That's why if you share my opinion on having a functional internet experience as first priority and an ad/tracker/etc blocking as second, the answer is NO.

If you don't share that opinion, the answer will be YES, please DO keep the defaults enabled, or use the oisd extra add-on alongside oisd full/basic.
No. Blocking youtube ads with domain blocklists seems to be a hit and miss
Alternatives:
- Use your browser, with add-on adblocker like uBlock Origin (Desktop, mobile)
- Vanced (Android)
- Newpipe (Android)
- https://kb.adguard.com/en/android/solving-problems/youtube-ads (Android)

You can ofcourse also just get Youtube Premium.
Yes. Domains that are listed in included blocklists but are excluded from oisd, can be found here.
I combine lists, remove domains that do not resolve, remove false positives, and the remainder is the list.
It's a list of domains, not software which potentially could have a backdoor.
Let's not overcomplicate things.
Yes. This is a domain blocklist, designed to be used in a network wide DNS based ad-blocker (Eg. Adguard Home, Pi-hole). Since it cannot block youtube ads, hide ad-placeholders, or ads being served from the same domain as the wanted content, a browser add-on ad-blocker (Eg. uBlock Origin or the Adguard Browser extension) is recommended.
When a friend claimed a domain name (poiasd.nl) (types really neat on a qwerty keyboard).. I beat him by 2 characters. Later decided to use it for this project.