I get all kinds of obvious spammy/dodgy emails in my gmail these days. Maybe one a week or something. Ones where you can't believe it didn't go in the spam folder automatically! Never got any before the last couple of years. I've seen the problem mentioned frequently on here in the last couple of years. Something evidently went very wrong with the gmail spam filter, and was never fixed. Yours is a slightly different issue, but I wouldn't be surprised at anything not being filtered out anymore.