It's a limit on ad spending during that 90-day period. Democracy Watch and the coalition's position is that a four- to six-month period is entirely appropriate. They're doing three months, and extending that even further is entirely appropriate.
What B.C. has done is that if you make a contribution to a third party that's going to be used—this is in the proposed bill, Bill 3—for government advertising, then it is limited to the limit they're setting on individual donations of $1,200, and it has to be designated as a donation for government advertising. Someone can donate a larger amount—a foundation can give grants to an organization or an individual can give a larger amount than $1,200—but that donation cannot be used in the advertising campaign that the third party might do.
Democracy Watch and the coalition agree with that limit. As well, it should be lower than $1,200. It should be $100, in the same way that you would limit candidates to receiving $100. Third parties could get huge grants from foundations for their programming, but in the case of election ads, they would have to get them in donations of $100 at a time.
It will be interesting to see whether that limit is challenged in B.C. when it's enacted, but in principle, it's democratic and ethical to limit the donations by third parties to those advertising campaigns.