Either way, they might not get a choice. The EU is going to regulate them more and more. My own country is passing a law to force platforms to remove child pornography within 24 hours of it being reported as an example of where it starts. Won’t be long before we make enabling nazi groups planning hate crimes illegal either.
"Males are not females" may be accurate when referring to biological sex, but in the context it is most commonly used (as harassment and as a neoconservative tribal signifier) it is referring to gender, and is roughly equivalent to saying "the gender you have now should match the gender you were assigned at birth, or your gender identity is illegitimate".
It's similar to saying "all lives matter". Of course they do, but the context in which its said indicates that it's an opposition to the explicit statement about black lives mattering, a de-focusing and dismissal. "All lives matter" or "males are not females" are not incorrect statements, but in the vast majority of the times they are used on the internet, they are used to express hatred of a group and the active dismissal of that group's efforts to achieve equal human rights. The context in which they are used makes them hateful. Hiding behind the "but it's scientific fact!" is simply a deflection from the fact that it is an expression of hate in the context in which it is used.
I shouldn't have to explain this, honestly. Please stop acting like a jerk to people online.
Also, if I want to say "the gender you have now should match the gender you were assigned at birth, or your gender identity is illegitimate", that's precisely what I'll say, but I tend to speak directly. Have you considered you might be projecting if you can read the literal words "males are not females" and conclude a person intends to say, "the gender you have now should match the gender you were assigned at birth, or your gender identity is illegitimate"? That seems like quite a leap.
Mach's principle is kind of an analogy I'm thinking of.