What do you look for in a public data repository/aggregator/catalog?

There are so many aggregators/repositories of public data out there. Some of the ones I use the most are:
- Kaggle
- UCI Machine Learning Repository
- Hugging Face Datasets
- the Data is Plural Newsletter/Site

For those of you who use these types of public data sources...what do you look for? Organization and ease of use? Trustworthiness? Documentation? A process for routinely updating from the original source? Something else?

data datascience public public data