Olympics - amateur or not?

Most of the events have allowed professionals for decades. Boxing was one of the last to allow them, not sure if there's any left now

Most of them are professionals and have been for many years.

Under the original idea of amateurism they have all been professional long before professionalism was allowed.

Originally no money whatsoever was allowed to be received for participation in sport. That would rule out things like the sports council funding the Irish athletes receive or sponsorship money like the big names all receive.

The modern Olympics were originally designed for the independently wealthy with thankfully we have moved on from.

Yup. Now they are designed for the capitalist economy, so that the money-making potential of the games can be maximised. Having big-name players participate increases broadcast revenue from the games but the big-name players, understandably, recognise the commercial value they add and want a cut of it.

The only areas where there is even a ghost of amateurism are in relation to sports whose governing bodies don't want the Olympics to eclipse the tournaments they themselves organise (and profit from). FIFA doesn't want Olympic soccer to threaten the standing and significance of the soccer World Cup, for example, so they arrange matters so that Olympic soccer is confined to youth teams (under-23), and few or no really big-name soccer stars feature in Olympic soccer.