This is the 12230th most frequent Russian word.
интернету
"Dative case of 'интернет' meaning 'to the internet' or 'for the internet.'"
The word "интернету" functions as a dative case, indicating the recipient of gratitude in this context.
Я благодарен интернету за возможность изучать новые языки.
I am grateful to the internet for the opportunity to learn new languages.
Here, "интернету" is used in the dative case to refer to the object the habit is developed towards.
Мы привыкли интернету, который всегда под рукой.
We have become accustomed to the internet that is always at hand.
In this case, "интернету" appears in the dative case, used to indicate the cause or reason for the change.