> Blue sales ultimately can't hope to come close to what big brand ads used to give.
I don't know, I think the hope is there. With these rate limits and some Fermi estimates, we can guess what Twitter's hoped-for revenue per user might be.
Suppose that this move is designed to move regular users over to Twitter Blue, and a regular user might ordinarily see 2000 tweets per day. Suppose further that Twitter would show 1 ad per 10 tweets, and ad sells for 3$CPM on average, and a Blue user sees 33% fewer ads.
An ordinary user would then expect to give Twitter 200 ad impressions per day, at $0.60/day of ad revenue or $18. By seeing 1/3 fewer ads, that ad revenue drops to $12, but Twitter picks up $8/month in Blue subscription fees, increasing the gross revenue to $20.
That feels about right, and the math gets better in the short term for Twitter if it's having a hard time filling its ad spots — a proportionally greater share of its revenue would then come from the pushed-for Blue.
Likewise, if Twitter is having a hard time filling its advertising spots, kicking non-Blue viewers off the platform is not a short-term revenue loss: the marginal eyeball is unmonetized. In the medium to long term, of course, Twitter is strangling the very content that attracts those eyeballs, and this is still a bone-headed business decision.