Usually, only disappointed/unsatisfied users will actively go to review without an explicit invitation . Ah human nature, it's lovely isn't it?
It's not against their ToS to ask from people to review. Just that though, not "five star review and get more space", that is against their ToS 😂.
I suggest send an email to users (with passing DMARC 😁) asking/inviting to objectively review Heliohost.
https://support.trustpilot.com/hc/en-us/articles/13806607359762-2-Set-up-review-invitations-Free?current=1
@Krydos @wolstech