its mainly pension investors
by putting your PRE-TAX income into a ETF you save 20-40% on a purchase because its PRE-TAX income buying the shares
and in many years when its time to sell(claim your pension) you dont suffer capital gains so another X% saving, because its in a pension scheme
ETF shares are NOT a claim of ownership of indirect BTC
ETF shares are a share of a trust thats valuation is pegged to a bitcoin PRICE of total coin owned by the ETF
you cannot as a end-user investor ask to convert share to BTC
its purely a share deal shadow tracing the bitcoin PRICE
Pensions are invested by companies, not the actual employees, who don't get a say in the investing at all. They also aren't available in any sort of employer retirement plan that I know of, and if they ever were, it would be in a connected brokerage account which is not "technically" in the plan (401k/457/403b etc)..and those often are very restrictive investment wise as well.
I run the State of IL Deferred Comp plan/457b. Err..I'm the sole advisor on the plan. There's not a chance in hell we will offer that to state employees anytime soon.
It's mainly for two things.. It's easy to buy if you've already got a brokerage account (which does not get tax qualified status) or an IRA, which gives you pre tax savings of course (but...it's taxed at ordinary income levels, not short/long term capital gains) OR Roth/Post tax..which could pay off as well in the long run and also will be taxed at ordinary income.. In some cases it will also only be taxed at the federal level and not at the state level..which is a nice benefit. State of IL does not tax retirement plan withdraws, however if you drive across the state line in to Indiana and live there, you will then pay both federal and state, albeit at ordiary income levels.
The second big reason is financial advisors. They can't make money off clients when they buy bitcoin from exchanges or OTC..but now they can purchase bitcoin (and their clients have been asking for years!) and charge a fee for it. Of course that potentially adds another 1% (or more if you're a scummy advisor) which is not in the clients best interest but 99% will be none the wiser anyhow.
OP-Bitcoin ETFs are a good thing for bitcoin. I won't ever own one..but I absolutely see the value of them and what it's doing and will do for bitcoin in the long run. Some may not like it, but it is what it is.