I have a suggestion for Envato - specifically for Wordpress themes which you sell on themeforest marketplace. Now as you are aware that after Wordpress 5.5 was released in August 2020, many themes with earlier code were not compatible. Now some authors have till date not updated their theme. How about you add a big banner stating that theme has not been updated and not compatible with latest wordpress version. That way new sales wont happen and hopefully authors will update their code to the latest version. Another point is some users may purchase incompatible theme and then face issues, so hope a warning like message to all themes not updated. And maybe extreme step like even removing the theme from the marketplace that way authors keep their themes with bundled plugins up to date. Just a suggestion.