Transportation was a small part of the royals enormous stake in slaves & slavery. British convicts were sold (indented) to the royals plantation owning pals.
Convicts, mostly petty thieves, were Transported for fixed periods after which they could return to Britain. Few made the trip back. Shortage of labour in the colonies meant better pay and living conditions than they would find anywhere in Britain.
As the British Empire grew wider still and wider, royal profits from ships and shipping, the slave trade, the opium trade, the arms trade, tea, cotton, sugar ect, ect, were banked abroad. Then as now, unctuous nominees were only to willing to do the royals bidding.
"Royal historians" would have you believe the first four Georges and William 4th squandered their ill-gotten billions. In truth. From the reign of George 1st this German family have needed to bank their loot offshore - in case the British public get their act together and hang the "royal" bastards.
When William 4th came to the Throne the family were immensely rich.
Like his brother George 4th (Piny) William 4th spent the last years of his "life" being carried around on portable bed. Sometimes called King Silly Billy, William 4th was more sinister than silly. His investments in slaves and slavery were common knowledge long before he became King.
Silly Billy never failed to voice his hatred of "reformers" who wanted Votes for none landowners. And an end to the Slave Trade. He was speaking for the entire royal family when he told the House of Lords. "William Wilberforce is a fanatic. I will never understand why anyone would want to end the Slave Trade."
1836. As King Silly Billy slipped into a permanent drunken stupor arguments over who-got-what led to rumours his bastard sonís were planning to bump-off the precocious, ten-year-old-heir-presumptive, Princess Victoria Saxe-Coburg. In 1901 Victoria would leave one-hundred times more in foreign banks than the fabulous fortune she inherited! Young Vicky