Okay, so adding an updated answer based on their recent contact with me.
They sent me multiple emails (5-6) at different times, after reading the answers I thought about giving it a try and replying to them ("my initial assumption was if it's free, then why not just give my less academic style articles to them [the contact person tried to convince me initially it would be free and will take very low amount of time]")
After I replied, he insisted on a call, but eventually, I tried to get the catch. It turns out, they will charge you £1950 per article, which was not mentioned initially.
They also include "The content of this email is confidential and intended for the recipient specified in message only. It is strictly forbidden to share any part of this message with any third party, without the written consent of the sender. If you received this message by mistake, please reply to this message and follow with its deletion, so that we can ensure such a mistake does not occur in the future.
To ensure we do not email you again, please reply to this email with the word ‘remove’ in the subject title and we shall erase all your details from our system. Thank you." in their emails so that no one can share the email content I guess. They sound kind of professional.
But, yeah, it's a full-on scam to me. With that fee, you can probably submit to a good-quality peer-reviewed journal.
Don't reply to avoid wasting your time.
Their service page with pricing: https://researchfeatures.com/services/