Me too, shoota. The French have been curiously lax with taxing foreigners. Until recently their rule that your main residence did not attract capital gains tax, a sensible one like ours, applied to foreigners who owned just one house in France. Of course, if you, a Brtish tax resident, sold it, you were liable to declare to HMRC not only any euro profit but any currency profit made because the exchange rate had changed from when you bought it to when you sold it. Needless to say, many people had French bank accounts to deal with the expenses of running it and simply kept the sum realised on selling it in that account and 'forgot' to mention that fact to HMRC. But often the gain was very slight for French tax purposes, because of the peculiar, arcane, allowances allowed for certain properties and certain periods of ownership and the owner was still well off under the new rules.
Overall, the French have not been particularly highly taxed. Their billionaires.like billionaires everywhere, have good accountants too.