Vlad , I think that give a metered plan will be attractive for lot of casual users.
I mean, IT/professional users could have heavy loads, but how about privacy-conscious non-professional users? Maybe they would comfortably stay below 2 search/day
The presentation could have simply two boxes:
- "Pay as you go": 0.0XX$ per search (and below you can say "this plan fits well for casual users who make less than 50 query/month"
- "Unlimited": flat rate of XX$/month (below: "this plan fits for heavy users that perform more than 50 query/month)
About annual subscription: maybe now it's too early, but I think we have to think about it again in the next months.
Once you'll find out the right economics, having funds for 12/24 months in advance could be useful (I'm a Proton user, and Proton has also 24 months)
For users on free tier, you've already a page with "remaining free query"; for metered users, this page can host the "already done query" with ongoing costs (for practicality reasons). In this page you can also suggest the user to switch to unlimited plan, in case his costs are rising or are already become more than the unlimited rate....and this suggestion will be seen as valuable for the user (and it will be a value for you too).