This has been addressed earlier many times.
When it comes to closing the spreadsheets for public viewing - the sheets were out and public till the end of the sale and now the aim here is to avoid people claiming tokens on other participants' behalf and using other clever ways of scamming honest bounty programme participants. We have already removed a lot bot accounts/links and have identified a number of bounty claim scam attempts.
The other massive issue with open spreadsheets is that these open bounty lists are large data sets which are stolen and misused by an ever-growing industry of scammers/phishers/spam advertisers. Upon discussing with other companies who’ve carried out token sales and have taken hard lessons, we’ve decided to learn from them and not publicize the sheets.
to be honest, if you really do not want to pay the work of the bounty hunter, by not showing the spreadsheets to the public, from the beginning the team just talking nonsense about this project