Stop operating dishonestly, either just have a pay wall, or offer a sincere free basic tier
I don't think there is anything intrinsically wrong with tiers of service. Quite the opposite, it is a way of making things economical for people. Having a free tier and a paid tier is also fair, and clever. You hook your customer, they love using the site, and eventually want more features unlocked. You should do that, or just offer a paid service. What you do right now is cruel and insulting. I see sites and apps where you can use for free with advertising, or pay and have a cleaner experience, or with less delays. Sometimes sites get greedy: I was at Youtube today and loaded a song. I had to sit through two commercials, no skip function and then less than one minute into the song it switched to a commercial break. That's disgusting. It's greedy and they wrecked the song--they wrecked my reason for coming to the site. I didn't feel an urge to pay for ad free service, but to abandon the site.
Your site is completely blanketed in ads--and its not that your selling ad space, you're deliberately making the site difficult to use. I came today and ads kept popping up, moving around, randomly playing loud video. I would attempt to click a link and an ad would have slid on in under my cursor. I couldn't read the contents of the page. You made the site non-functional. On the page where you can pay the ransom to have the site freed, you advertise much greater speed as a benefit because you've so completely glutted the free one under ads.
So, what I get out of all that, is you think I'm stupid, you feel manipulating me is good business. You are fraudulently claiming to have a free basic tier, but what you provide is an unusable site designed to be frustrating and distressing. I am autistic and ADHD and your website makes my heart race with confusion and panic. There is a distinct difference, well familiar and recognisable by now, between websites with advertising and sites employing the ad bomb strategy in attempt to compel us to pay so we will actually be able to use the site. This is not tiers. The free tier is a slap in the face. It tells me you don't respect me at all and your happy to mess with me and manipulate my money out of me. What makes you think I would want to do business with people who treat me like this?