Could this issue be related to Gmail's spam filtering? For approximately 2 years now it's been downright porous, I'm getting on average 1 obvious spam message i

Could this issue be related to Gmail's spam filtering? For approximately 2 years now it's been downright porous, I'm getting on average 1 obvious spam message in my inbox that is something like: c0nGrats-You_HaVe_Won_ThE_Pr1ze! ..Or some silly variation of this that takes literally 0.1 ms for a human to discern that it's spam. Yet something happened to Gmail's spam algorithm in the last couple years that has been consistently letting these through. To be fair, it does catch most spam but it's only batting something like 75% and the spam it does catch is often times much less obvious to human eyes than the stuff it lets through.