Confidentiality Clause On Survey Any User Know Why Balde Make Sign Confidentiality Clause Before Leave Celtic ?

Any user know why Balde make sign confidentiality clause before leave Celtic ? - confidentiality clause on survey

Bobo Balde Sunderland collapse due to the transfer of players refusing to sign a confidentiality agreement. Big Chief wonder what secret to avoid a value of £ 40,000 per week to the public?