Probably because they are recent? Probably because they haven’t been spammed since this time last year? I mean, this isn’t a 1:1 comparison like you’re saying it is.
This isn’t “discrimination” but rather just a completely different situation entirely.
Saying this is discrimination is like saying you’re being discriminated against for not getting a job. You might be completely unqualified or have applied and been rejected 50 times. But no, it’s discrimination.