If I want I can buy every bot, private and public, available.

Not every bot owner sells their product ...
For example I myself had created an odds calculating and arbitrage program some years ago ... and declined every offer from anybody to purchase it because it gave me a decisive advantage against the bookies. :-)

But of course I know what you mean, you could get access to some very well playing bots.

But you are neither the whole ecosystem nor a typical Splinterlands player.

Your behaviour honors you, but if the ecosystem is dominated by bots, many human players will get frustrated and potential new players won't join.
I call that a huge problem for the future of the game.

You have the advantage that you might like the earnings (the ROI) from the game but don't depend at all on them in any way. However, for other people it matters quite a lot if they win a tournament or if they reach rank 27 behind of 26 bots.

And really: in addition it is simply no fun, if the big majority of the 'opponents' is just software.