Trying Netflix "Standard with ads" tier which is $8 vs $18 per month. Differences:

• You get ads. Generally I've seen one or two 30s ad breaks (sometimes no ad breaks, sometimes up to 2m ad break with two ads). The ads are standard television-type ads (i.e. big brands probably paying a bunch for that ad space). There is a timer on the upper right counting down until ads end. Apparently Kid logins have no ads, which is just as well since they can't buy anything.
• Some programming is not available in ad-tier. These are shown with a big obvious lock icon on the upper right of the title graphic when you're browsing. All 152 Movies and Series Blocked On Netflix’s Advertising Tier (April 2025). Based on the April list this doesn't affect my K- and C-Drama watching and mostly would affect watching some popular movies.
• No Picture in Picture. At least on my iPhone and iPad it no longer goes to Picture in Picture when I go to another app. Makes it less convenient to play a game while watching Netflix since I then have to use a second device to watch Netflix.

The ad-tier is definitely great with me and you save $10 per month. 2m of ads per 1h show is nothing compared to Viki's free ad-tier which has like 90s to 3m of ads every 10m or so and when you first resume watching a video (and Viki's ad-tier is 480p video).

Compared with Viki's standard plan which is the same price $8 per month Viki has no ads, 720p video (Netflix ad-tier and standard are 1080p), 1 active device (instead of 2 for Netflix), about 2/3rds of Viki catalog available.