If anything it's probably easier. There are a glut of payment processors willing to help you out that would take a fraction of your profits compared to a curate

If anything it's probably easier. There are a glut of payment processors willing to help you out that would take a fraction of your profits compared to a curated download-only marketplace like Steam. There are, admittedly immature, marketplaces for web-based games such as itch.io However it's still possible to deliver a platform-specific download with the many web-wrapping runtimes out there (cordova, apollo, etc). It's not perfect right now but it's where the action will be in the next few years.