It's documented that the daily WORDLE word comes from a list of 2315 5-letter words and that there is a specific order in which these are being presented for that viral word game. Presumably the sequence was chosen randomly at the "beginning", rather than make a random choice each day from among the 2315. This prevents the same word coming up twice in the first 2315 days of the puzzle.

Suppose however that they had decided to make each day's word selection to be made randomly, without regard to whether the word had been chosen previously. How many days could the set of words for the day run before the probability of a repeat would exceed (a) 1/2, or (b) 99%?