I also believe cis women with very high testosterone (much higher than other cis women through supplementation or other means) also may have an unfair advantage.
Women that have naturally high testosterone do not have either the benefit of male puberty and 'male' levels of testosterone, nor do they have (unless they may have cancer or very significant health issues) testosterone levels as high as the minimums set generally for some male sports which is 10nmol/L . There may be issues with sports using 5 mol/L but it seems accepted that
Most testosterone values in PCOS will be ≤150 ng/dL (≤5.2 nmol/L).
Testosterone values of ≥200 ng/dL (≥6.9 nmol/L) warrant consideration of an ovarian or adrenal tumor.18
This is from the link below
www.ncbi.nlm.nih.gov/pmc/articles/PMC1069067/ Titled 'Polycystic Ovarian Syndrome: Diagnosis and Management' by Sheehan. It is dated 2004 and maybe there is a more up to date one but this sits in line with what I have seen discussed by those evaluating the sports decisions.
Therefore it is going to be very rare that a female competitor would have that problem. Can I ask what females you are referring to?
Because if you are talking about athletes with differences of sex development, even though many media outlets have to report them as 'female' they are in reality, male with medical conditions. There are several of these competing currently in different sports and there are many discussions being had that they are to be excluded from sports or that they need to reduce their testosterone below 5nmol/L.
However, please do not make the mistake that these are 'females with naturally high testosterone'. They are male with tests and have differences of sex development which has meant their bodies have developed enough of the advantages of being male to be world champions in female sport.
And they should not be used as comparators here and their bodies should not be politicised to score points.
And of course, those women who are taking testosterone are banned from sport because it is a well known sports performance enhancer. If they are transitioned females, they may be able to compete with males if that sport allows that (safety etc).
It is always interesting though, because most sports would allow that person to compete, but they simply cannot beat males who have gone through puberty in most sports. That is why you do not hear of 'transmen' winning their events.