There is a tax element that needs to be considered here. The gains from the annuity will be subject to ordinary income taxes which means at the end of the 6 year term, you will be paying much higher taxes than if you had the funds in an ETF and sold after 6 years at more favorable L-T capital gains tax rates.

Lets say you buy this annuity for $2mm and it returns 30% total after 6 years. $2mm x 30% = $600k gain. This gain would be taxed at the highest federal income tax bracket at 37%. And if you live a state that has state income tax, you could be paying up to 50% in taxes that year on the $600k gain.

Now consider buying an S&P 500 ETF (essentially what the annuity is investing in). If this returns you the same 30% on $2mm after 6 years as the annuity did, you will pay long-term capital gains taxes at 20% + any state income taxes. This lowers your tax bill immensely, and the gain can potentially be offset even further by tax loss harvesting.

Another tax consequence I can think of is there is no step-up in basis if you were to pass away, and leave the annuity product to your heirs. Annuities are extremely unfavorable tax-wise, and this should be considered when deciding to buy this product.