Spy x Family had ~500 million views on that platform in 2019, their volume sold for more than a million copies (pre-anime) each ever since. Growth and stickiness is what matters for any series, and well see when the physical + digital copy sales figures are out. Thats the true yardstick.
Remember: Shonen Jump+ is free. The producers publishing their content there are well aware that the platform is meant to advertise their product, to entice readers buy & collect the actual copy in which the true revenue is made, as far as manga goes.