It can be used by anyone (including orange man and scammers) for anything (including drugs, money laundering or speculation), because its money, and money can be used in all these ways. Bad people use money to do bad things should be no surprise, the majority of drug dealing money laundering and speculation is still done in the US dollar, because it is the dominent global currency. Trump and scammers also have dealings with dollars.
Now thats out the way...why is bitcoin better money?
Fiat money (pounds, dollars, euros etc) are printed by central banks. They are not technically backed by anything, but they are implicitly backed by the issuing governments economy and its ability to extract surplus labour from its population in the form of taxes, and its military/political power and their ability to steal/scam resources from other nations.
Governments have unlimited printing ability, however printing more of their money makes them less valuable - the exception is the US dollar, because all oil is sold in dollars and therefore other countries need dollars to buy it (ie the petrodollar). The dollar is therefore a special case of fiat currency, because it has implicit backing of energy, which is why it has become the world reserve currency.
Bitcoins are not printed, but mined, by using electricity to hash hard sums, and allocated quasi-randomly to those who participate. Every 10 minutes someone who is providing power to the bitcoin network gets a reward in bitcoins - currently 3.25 btc, but that gets halved every 4 years. They then get the right to validate all the transactions that have happened since the last bitcoin was mined, by adding them to the chain of transactions that goes back right to the genesis block in 2009. If the winner of the next block disagrees with the previous winners list of transactions, they can choose an alternative winner of the previous block. There is no central authority tho that decides - everyone must agree.
That way everyone on the bitcoin network has full consensus over ALL of the transactions that have ever happened in the entire history of bitcoin. Everything is transparent within the network. You can see which wallet send how much where at which time. It is entirely transparent. So while you can use it for crimes, drug dealing, scams etc. Its all recorded in detail and can never be erased. It is also permissionless. No one can step in and decide that they dont like you sending btc to a particular wallet
There is a hard cap of 21 million bitcoin, when the final satoshi is mined in 2040, unlike fiat, where there is no cap on the amount of pounds/dollars/euros etc that governments can print - there can never be any more than 21 m bitcoin, and the supply schedule is known in advance.
Bitcoin is decentralised, permissionless, public, neutral borderless money with a hard supply cap and known distribution schedule that is natively digital and cannot ever be shut down. The days of fiat are numbered and there are children growing up now that will look back on this age of fiat currency with amazement that older generations ever fell for the scam.