It seems to be a trend over the last 2 years. Not sure why, but it could be in reaction against the anti-employee practices google/apple & co were engaged in:

It seems to be a trend over the last 2 years. Not sure why, but it could be in reaction against the anti-employee practices google/apple & co were engaged in: http://arstechnica.com/tech-policy/2015/03/judge-oks-415-million-no-poaching-payout-to-apple-google-employees/ http://arstechnica.com/tech-policy/2015/03/judge-oks-415-mil...