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As the gatekeeper of science, reviewers play an essential role in academic publishing by improving the quality of papers and maintaining research integrity. In this research, we examined whether reviewers receive gratitude from authors for their reviewed manuscript. We analyzed over 46 million papers from 2001 to 2020 and found that although the proportion of acknowledges to reviewers in different subject areas has increased in recent years, the overall proportion of acknowledges to reviewers is low, with the lowest proportion being the field of Health Sciences and the highest in the field of Social Sciences. We also discovered that the proportion of acknowledged reviewers from different regions varied, with America, Europe and Oceania having a generally higher proportion than Asia. Our results indicate that the scientific community is generally unaware of the contributions made by reviewers, and reviewers have not received the acknowledgments they deserve. Additionally, we found that a small number of journals had more papers acknowledging reviewers. Through regression analysis, we found that although authors acknowledged the reviewer's contribution, their decision to write down acknowledgements were influenced by their language proficiency. [ABSTRACT FROM AUTHOR]