No income tax on business or personal income. You can become the state’s resident after spending just one night in a hotel and opening a bank account. That’s partially why it’s highly favored by RVers who choose to longer have a permanent home.
There’s opportunity to modify the state’s politics. ;)
A lot of investors, including Sam Altman, have said that SV isn't the best place anymore. It's not worth it for them to move out, but I doubt they'd do SV now if they had a choice. SV was popular because as Paul Graham said, everyone was optimistic and always smiling, but this really isn't the case anymore.
If you are doing a "startup", there are benefits to being near SV for the VCs and talent who want that life. If you are just wanting to start aomething new and not seeking the YC/VC model, choose whichever town makes you happy.
What I expect to change over the next 10 years is an increasing number of people making the latter choice.
For me, India is one of the best place as it has a HUGE online population, growing spending capacity, quite a large number of huge problems to be solved (for e.g. there isn’t even good Adult ADD care available in India in 2020, many many more probs) and a good number of decent tech workers (rising number of great tech workers).