I was recently looking into the
Indian Journal of History of Science because in 2021 they handed the journal production over to
Springer. So articles are now paywalled on the Springer site. BUT all articles are also
freely downloadable from the IJHS website
at INSA in Delhi. I wrote and asked INSA what was going on, and they said
that they had struck a formal deal with Springer for this arrangement.
So it's legit. But you would never find this out from the Springer
website.