Pure math has a far greater vulnerability to this than applied math. Top journals have impact factors of around 5.0. Respectable but tiny specialist journals can have impact factors less than 1.0 (like, 0.4). Meanwhile, MDPI Mathematics is a Q1 journal with an impact factor over 2.0.
The now-standard bibliometrics were not designed by statisticians :-)
The now-standard bibliometrics were not designed by statisticians :-)