IP editors are usually *less* anonymous than logged-in users; and often do very constructive edits [3].
Paying historians would be a can of worms.
Anecdotally, one recent (IP) editor claiming to be a historian got blocked for a month in relation to the #SashaKorban versus #Jorit murals in #Mariupol [4][5], due to not refraining from personal attacks after multiple reminders.
[3] https://en.wikipedia.org/wiki/Wikipedia:Not_every_IP_is_a_vandal
[4] https://en.wikipedia.org/wiki/Sasha_Korban