They are developing systems and rulesets to eliminate this. There are already rules in place banning certain set-ups in races such as Zwift Classics, and winners need to validate their equipment and verify their performance with outdoor data.
The British eCycling national championships was a benchmark of how it should be done. The qualifying event was open to all who had a British Cycling race licence (so nothing to do with Zwift) and the top ten had to provide strict data about performance and equipment. At least one person in the top ten was DQ’d for suspect performance. The title was decided at a live event in London where there was a weigh in on the day of the event, and rider all used the same equipment calibrated by British Cycling.