Is there any doubt at this point? It was Mossad. It couldn't have been an American agency, the fallout would be too great.
Edit: This has been suspected as early as 1992. This is not pizzagate/qanon bullshit. https://www.reddit.com/r/conspiracy/comments/ch7bnm/the_myst...
Where is this coming from?
Also, why would blackmailing need someone to bankroll it? Blackmail makes money. It bankrolls itself.
If one needs to shove Mossad into the storyline, yes. But it's unnecessary. Epstein getting wealthy by blackmailing Maxwell and using that wealth (and power over his blackmailing victims) to get wealthier, bully witnesses and lobby powerful people is plausible by itself.
If he just wanted to get his own rocks off, why bring in these guys? Prince Andrew, Clinton? It'd be safer to ensnare middling business leaders no one has ever heard of if he just wanted money. But such people are no use to state intelligence.
We have no evidence any of Prince Andrew or Clinton did anything nefarious in the midst of Epstein. Epstein was just doing what rich Americans do--cohorting with his fellow powerful.