It's not the first time Ban vs Aus series messed up due to no broadcasters and I don't know who's at fault here BCB providers or the Aussie broadcasters, but they ended up streaming the match on YouTube and possibly a full series. For Indian viewers, it's on FAN CODE because they had full media rights for Bong's home season.
I give partial blame to BCB. We have seen even in men’s cricket BCB were not able to attract any foreign broadcasters previously. Only the local broadcasters go to BCB because local people watch the game. That is why a part of the blame falls on BCB’s side which handles these broadcasting stuff.
But I think the rest of the thing has to do with popularity. Not many people, especially in Bangladesh, watch Women’s cricket. So it is not surprising to me that they could not even find a local broadcaster to show these games on Television. These will take time, especially in a country like Bangladesh.
It's just that the Bangladeshi broadcaster (Main provider of feed) keeps failing to strike a deal with Australian broadcasters like FOXTEL or SEVEN Network and even for the English market (SKY, etc). This could happen due to incompetency, foreign broadcasters don't want to pay much, or maybe Bangladeshi providers are asking for too much money.