I would not consider Instagram being "acquihired".
See definition from wikipedia (https://en.wikipedia.org/wiki/Acqui-hiring): "...the process of acquiring a company to recruit its employees, without necessarily showing an interest in its products and services—or their continued operation"
See definition from wikipedia (https://en.wikipedia.org/wiki/Acqui-hiring): "...the process of acquiring a company to recruit its employees, without necessarily showing an interest in its products and services—or their continued operation"