Firstly, let's try and understand what this law is talking about

This law is basically trying to explain to us that when 2 currencies(bad and good) have equivalent value is available in an economical system, the bad money will eventually drive out the good money from circulation

Secondly, let us understand the difference between the terms "good money" and "bad money
Well, by the law, I think good money is referring to money with more value or better quality
While bad money has less value in the economy

Now let us understand why the bad money ends up overthrowing the good money
And to me, the fundamental reason for this according to what you explained is due to the fact that people tend to hold the good money to themselves and spend the bad money and this will eventually lead to bad money being more circulated than good money

Now, to the matter at hand
You believe that this can end up happening to Bitcoin, but I'm here to tell you that you have nothing to worry about. This law can't apply to Bitcoin
Why? You may ask
Well
1-by the definition I made, they said 2 currencies of equivalent value
Bitcoin has no mate, has no competition, and has no other crypto currency with equivalent value
I know you may say fiat can be considered it's rival but to me, Bitcoin itself is above any fiat, or is there any currency that a single unit of it costs $67,000
Well, if you still have doubts about that reason, let me go for 2
2- Bitcoin is limited, unlike fiat, which can be printed endlessly by the government
The last point I can think of would probably be the fact that Bitcoin, unlike fiat, is a digital currency so.i ser nor reason why this law can affect Bitcoin

The only scenario where I think this can occur is if there's a law worldwide that is basically against Bitcoin and causing fiat to be more favourable to Bitcoin