Big investors who put money into crypto aren't buying shitcoins like TRUMP or even dogecoin. I'm pretty sure what they buy is bitcoin & ETH if they invest in crypto at all. They're also probably trying to make a quick buck, too, as opposed to making a long-term investment.
I mentioned dogecoin. That's a coin that's going to have a theoretically unlimited supply if it survives long enough, because there's no cap on how many coins are going to be mined. If it had a cap, it might be useful in commerce, but it's pretty much always traded pretty cheap. And that's just one of hundreds of altcoins in existence. All of these coins are causing "inflation" if only for the fact that there's only so much fiat money being invested into crypto. There are too many cryptocurrencies in existence and demand doesn't keep up with it.
Dogecoin is not a shitcoin
There is no hype in it, it is not even actively developed any more, but its price is pretty resilient (in bitcoins). This tells us a very important thing which most people fail to see. That Dogecoin is likely among the top 10 or even 5 coins with most real world adoption. As its price is ridiculously low, it is very useful for online gambling, and that gives it value. You may not like gambling (which I understand), but this is real use any way you look at it
Also, while doges are not capped, their supply inflation diminishes every year in relative terms (percentages). It means that the coin's monetary base growth is slowing down, and now it is already pretty much insignificant and comparable to capped coins. Bitcoin's monetary base is also expanding if you didn't know, so from any practical point of view the end result (in terms of new coins mined) is not much different