Lots of launch providers and various 3rd parties have been providing rideshares for a while. e.g. there's the big thosuand pound payload, with an extra rack of cubesats to take advantage of extra fairing capacity.

The starlink satellites are relatively small, but they're still larger than Sputnik for example. ISRO has launched 100+ satellites at a time, although I believe those were mostly cubesats which are an order of magnitude or two smaller than the Starlink sats