Massive fan art vandalism

Some user is replacing several posters of movies from the year 1980 with fan arts. Although I have reported and fixed several of them (at least 20!) the situation is getting out of hand.

I will leave some samples, of movies with vandalized primary images so you con investigate and find the responsable to take measures.

https://www.imdb.com/pt/title/tt0080736/?ref_=nv_sr_srsg_2_tt_8_nm_0_in_0_q_the%20nimit

https://www.imdb.com/title/tt0080437/?ref_=nv_sr_srsg_0_tt_3_nm_5_in_0_q_the%20big%20red%20one

https://www.imdb.com/title/tt0080377/?ref_=ls_t_33

https://www.imdb.com/title/tt0080474/?ref_=ls_t_35

https://www.imdb.com/title/tt0080798/?ref_=ls_t_51

https://www.imdb.com/title/tt0081480/?ref_=ls_t_52

https://www.imdb.com/title/tt0081568/?ref_=ls_t_55

https://www.imdb.com/title/tt0080408/?ref_=ls_t_57

https://www.imdb.com/title/tt0080907/?ref_=ls_t_66

https://www.imdb.com/title/tt0080756/?ref_=ls_t_70

https://www.imdb.com/title/tt0080605/?ref_=ls_t_77

https://www.imdb.com/title/tt0080738/?ref_=ls_t_76

https://www.imdb.com/title/tt0081207/?ref_=ls_i_56

https://www.imdb.com/title/tt0081568/?ref_=ls_i_55

https://www.imdb.com/title/tt0081696/?ref_=regsn_rvi_i_1

https://www.imdb.com/title/tt0080031/?ref_=ls_i_68

https://www.imdb.com/title/tt0081187/?ref_=ls_i_75