And these are also mostly speculation. The crux of the OP’s argument to me is that The company and others in this space position the yields as being “in kind”

And these are also mostly speculation. The crux of the OP’s argument to me is that The company and others in this space position the yields as being “in kind” to savings account yields despite it very much being a different risk ballgame. See the frequent hacks on https://rekt.news/ https://rekt.news/ for example. Do sites like Celsius explicitly claim to be as safe as insured savings banks? No of course not but they play a similar linguistic game of association to Tesla’s “autopilot” nomenclature. As with most things do your own research and don’t risk what you can’t lose.