Best platform to publicaly share data
I'm biased, as a long-time IEEE member, but I recommend IEEE Dataport as a good place to store large data sets that are likely to be of interest to others.
As their About page says:

IEEE DataPort™ is a universally accessible web-based portal that serves four primary purposes:

Enable individuals and institutions to indefinitely store and make datasets easily accessible to a broad set of researchers, engineers and industry;
Enable researchers, engineers and industry to gain access to datasets that can be analyzed to advance technology;
Facilitate data analysis by enabling access to data in the AWS Cloud and by enabling the downloading of datasets
Supports reproducible research.