https://www.wordfence.com/blog/2019/03/peculiar-php-present-...
As for hosting providers: GoDaddy, BlueHost, etc - yes, they're all bad. But that doesn't justify moves like these.
Serious question though, on the technical part: WP needs an advanced-cache.php file, which needs to be in wp-content in order for the cache to work; this will list as dropin. Are you sure the endurance cache is MU and not dropin? (Genuine question).