I'm very happy I asked the question and other users really responded very well. All the responses were really helpful. I think other newbies like myself learned a lot from the replies.
Fair enough that you knew this but many investors think that when the market is very volatile, the next thing that comes to their mind is to convert everything they have to a stable currency, for short term it is the good but using it to hold value have his own side effect. Some months ago, USDC deppeged in value, they have to use some back up funds to close that loss before it pumped back to 1:1 of the real price to USD.
Stablecoin values lies on what assets they are backed with, the ones we have right now are not transparent enough, I'm not sure why they are always like that but they don't disclose how strongly the asset that back the ticker name they list on public exchange and that is why you shouldn't trust, they are business enterprise by the way so you shouldn't trust them at all.