For the same reason the opinion of someone like Rupert Murdoch matters. Its not about their viewpoint directly as an individual, its the fact they control massive platforms that can and do sway public opinions.
In murdochs case he's had an influential impact on British politics over the last 40 years and has used his media empire to act as a king maker.
Musk isn't as savvy or as intelligent as Murdoch but that doesn't mean is influential position should be ignored.
I don't like Elon Musk, but can you explain what makes him a fascist? I feel like people are really throwing that term around a lot and it's kind of concerning.
I think eliminating voting rights for citizens without children is a fascist policy. Fascism is about enforcing a "correct" or "natural" hierarchy in society. Historically this has usually been about race, but has also included other factors (for example, disabled people were the first group targeted for extermination by the Nazis). For some of us, not having kids is a choice (and imo a valid one that shouldn't be punished by the state). But this sounds like an easy way to discriminate against same-sex couples, and all fascist systems have a history of doing that.
It's a fair question, but you're probably getting downvoted because you "feel like people are really throwing that term around a lot and it’s kind of concerning". People are throwing the term around a lot because of all the fascism, and the fact that you find the term more concerning than the actual fascism is a bad look.
I personally find Ur-Fascism by Umberto Eco a good read. Fascism is really hard to pin down because it's quite a wide category due to the different tendencies in history.