Has Google ever publicly talked about their spam performance filter over time? For me this past year I get obvious spam messages in my inbox every week. Is it t

Has Google ever publicly talked about their spam performance filter over time? For me this past year I get obvious spam messages in my inbox every week. Is it that they can longer filter at the required scale? It seems hard to believe these messages could evade even the most rudimentary filters, so I assume they're not being filtered at all.