I'm also with a European (German) bank and receive notifications...

I'm also with a European (German) bank and receive notifications every time an Australian company requests the identities of their shareholders from my bank. The reason they do it is that at least all major German banks keep shares of Australian companies held by their clients in a single custodial account as a result of which Australian companies would only see the bank as shareholder in the shares registry but not the ultimate holders.
I've been holding Australian shares for more than two decades and have gotten many of those notifications but the frequency of requests from BCB was indeed elevated in recent months. While this can be an indicator for M&A activities I fear in this case it is related to the capital raise (identify large holders and explore their readiness to subscribe) and the frequency of these requests could mean they have been considering the raise for months.