They are usually private datasets and details of the training are not usually disclosed. There could also be duplicated effort by every company competing in th

They are usually private datasets and details of the training are not usually disclosed. There could also be duplicated effort by every company competing in the field. There is also the side that it would make it harder for startups to compete as the progress is made on training on large datasets using huge clusters of machines. Such datasets and compute power is impossible to acquire for small companies.