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Why doesn’t every company and individual use tax-havens to pay less taxes?
There are tax free bonds in the United States.  They are for things like public housing and other urban projects.  They are tax free for everyone but only rich people buy them.  Why?   The issue is that the tax free nature of the bond is included in its yield.  So rather than yielding say a 5% return, they figure that the owner is getting 20% off due to not paying taxes.  As a result, they only give a 4% return but are as risky as a 5% return investment.  Net result, only rich people invest in tax free bonds.  "Rich" is defined here to mean people paying a 20% tax on long term investment returns.   Or take the State and Local Tax (SALT) deduction, which has been in the news recently.  Again, it is technically open to everyone.  But there is also a standard deduction that is open to everyone.  For the typical family, state and local taxes might be 5% of income.  So for a family making $100k a year, that's $5k.  The same family can take a $13k or so standard deduction instead of itemizing.  So why would they take the smaller deduction?   As a practical matter, two groups take the SALT deduction.  People rich enough to pay more than $13k in state and local taxes and people who also take the mortgage interest deduction.  So it helps a lot of people who are rich quite a bit.  And it helps a few middle class people some.   But if you are lower middle class with a $30k mortgage on a tiny house and paying 4% interest, then that's only $1200 a year.  Add in property taxes of $3000 and SALT of $2.8k and that's only $7k.  Even if the person gives $3k to charity, the $13k deduction is a lot better and requires less paperwork.   Contrast that with someone who has $500k mortgage at 3.6% interest.  That's $18k in interest alone.  Add in a SALT of $7k and property taxes of $50k, and there's $75k of itemized deductions, much better than $13k.  Now a $7k donation to charity is entirely deductible.  And even after the mortgage interest deduction goes away, the other $64k remains.