The image is a convenient "shortcut" for users who struggle with creating a vanilla installer or who need legacy boot support. However, due to security risks and the availability of better, transparent tools (like OpenCore), it is recommended primarily for testing or temporary installations on unsupported hardware.
Olarila mitigated this by having an active community. Senior members would verify checksums, and the reputation of the site relied on the cleanliness of the files. For many, the risk of a sketchy download was outweighed by the sheer convenience of skipping the installation creation process. olarila catalina 10.15.7 download