NHK日本語発音アクセント辞典 seems to only list ありがとう{LHLLL}. And I think the polite form
is most commonly ありがとうございます{LHLLLLHHHL}?

But I think I also hear what sounds to me like ありがとう{LHHHH} or ありがとう{LHLHH}.
Is it an intonation issue?

Some examples:

  * Am I correct in thinking [this one](https://youtu.be/oRCsy25ER64?t=231) is 語尾上げ? 「君、今日も頑張ってくれてありがとう」
  * What about [this one](https://youtu.be/IBrUxfKQdEA?t=975)?
  * And [this one](https://youtu.be/zwW9qvs2M50?t=859)
  * [This](https://youtu.be/alM-g--UJt4?t=778)
  * [This](https://youtu.be/W__7mkTAYiI?t=363)
  * I'm not sure if [this one](https://youtu.be/YHzoGWjcLRg?t=530) is ありがとうございます{LHHHHHHHHL}
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pitch-accent intonation
ありがとう pitch and intonation
I think all of your clips can be explained by:

  1. Quoting と or とか can make the previous word 尾高 sometimes.
  2. You have some non-標準語 clips. For instance, it's ありがと＼う in Kansai-ben. <https://youtu.be/yqWcakJhaok?t=605>
  3. The last clip sounds like あり＼がとうございま＼す to me.

It's not a good idea to use TedX talks from different parts in Japan as a
reference for standard pitch.
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The fourth and fifth are said with one of the natural intonations, not the
annoying kind. The first three are also that, quoted with と or って.

At normal speed, the polite form would be ありがとうございます{LHLLLLLLLL}, but with the
flat part not really staying flat but going further down. It's just that the
last speaker’s accent is such that the initial fall is not very clear.

It's ありがとう{LLLHL} in Kansai-ben, by the way.
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