Both those things can be true. If many of the top advertisers pulled their ads then they could be going out to the long tail and showing a larger number of lower value ads to compensate.
It's also possible you're in an A/B test to show a different ad volume.
In general sample size of 1 for ads (or feed ranking) is hard to reason about.
I used to get ads for Apple and Nike mostly with the odd thing in between.
I haven’t seen a Nike ad all week , but apple is showing up and tons more ads in asia showing up.
So I’m convinced there’s more ads than usual.