Sorry for clickbaity title, obviously there will only be 21M BTC.

But with more banks, institutions, and CEXs trying to custody the BTC and creating ETFs, options, and perhaps other derivatives in the future, how can we be sure there won't be an "infinite" supply of these synthetic "shares" of BTC?

I have a feeling the mass adopters will ultimately trust big banks to custody their BTC for them especially if some yield bearing instruments become popular. I fear the banks may engage in shady behavior to manipulate prices further.

Thoughts?

I only became aware of what synthetic shares are by studying how GME investors have explained how the stock markets actually work. This is all related to BTC in the sense that I'm trying to see how to play $GME as it transitions to MSTR 2.0, but the synthetic shares for GME is interesting....wondering if this is possible for BTC and IBIT etc.