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Despite we dont have a 100% official answer, we can deduce the possible reasons

He features most prominently in Sauron, the Dark Lord decks, which may be a little bit off, lore-wise, but I'll allow it because of how effective he is at producing a threat in that deck

One Reddit user commented on Kraken of the Strait's low-quality CGI-style look, saying that the giant Blue creature "looks like a cutscene from a PS2 game." Certainly, the card does seem to be of lower quality than cards of a similar style

Some powerful cards are often more sought after than weaker ones

13, 2025 A card that has an "isn't affected by [...] effects" effect was given an effect that triggers at a timing such as [When Attacking]