Secretly Group interview questions

I have applied to numerous jobs at Secretly Group over the years, including getting to the interview round once. For this instance, when I had the interview, I didn't think the individual was very interested in me, and I was ghosted. However, I have been applying to numerous jobs at SG throughout the years since that interview, and I think they have a tendency to scrap applications and job listings. I see numerous job listings for this company that only remain active for a few days. When I have applied to various positions at Secretly Group, the job listing is often removed a few days after posting, and I never receive word about the job again. What bothers me is that a lot of their applications require personalized cover letters that include recommendations or feedback for the company. I don't understand the practice of posting and deleting numerous jobs with no communication or indication that someone was actually hired. When I submit applications with personalized cover letters that include advice (as instructed) for the company to pursue, I do not even receive a rejection, and the job listing completely disappears; I frankly am unsure if there was an actual opening to begin with. For a large company, I can see this happening once in a while, but I see SG do this numerous times a month, often with positions that are very similar to one another, and the only evidence I can find that there was a job listing at all was my confirmation email and third-party websites advertising the job that directed to an error on the SG website. I'm sure there is a lot of internal movement within the company that is out of a hiring manager's control, but I think a company asking people (including people struggling with unemployment like myself) for ways to improve a certain department or expand their business in order to apply, take the advice, and delete the posting and ghost applicants; that to me is problematic and dissuades me from applying again. I am now very hesitant to apply further because I don't know if the job postings are indicative of an actual recruitment or if they are staged for seeking ideas from external professionals, nor do I know if the personalized cover letters I spend time writing are actually read for the purpose of job candidacy. The least that can be done is to send an automatic email with a rejection, or that the job posting was closed for a legitimate reason, but after applying to so many positions and interviewing and being completely ghosted, and seeing the frequency of these job listings appear and disappear on the website. SG seems like a wonderful company, but I really wish they could improve their hiring practices.

starts with a hirevue + then goes into a round with hr + hiring manager and then eventually a final round with the head of the department. some technical questions but mostly behavioral!