A personal recommendation system which constantly trains locally on data from our day-today activities and offers the model on demand to the services seems like an straightforward way to address this need-gap.
Our smartphones are capable enough for this purpose, As they are already being used for training models but the barrier would be to access our activities on other platforms due to the closed nature of apps, smartphone OS and zero interoperability. Web may not be as constrained, So I don't see a a major constraint in developing an add-on which tracks activities on demand and stores the data locally.
But large platforms do provide some way to export our bulk data for legal compliance and perhaps this might be an easier way to fetch our data for training.
How about a service that temporarily boosts the Internet bandwidth of the participants of the Internet call by changing their plan? Say if one of the participant has only 2mbps bandwidth and the said service coordinates with their ISP to increases it to 200mbps for the duration of the call.
The service can be paid for by the organizer of the Internet call.
Dates are made visible again, Reverting a earlier decision as explained in /comments/801 as there are instances when the date of publishing the problem/comment can be useful for historical context. But I still urge problem solvers to not hesitate posting their solutions for old problems as it's required as long as the need-gap exists, The fact that you developed a solution for a problem now shows that the need-gap exists.
Showing dates on the list of problems, comments, in permalinks and not shown in individual problem pages. This allows date to be easily accessible to where its needed and who needs it while not showing in the areas where it might inhibit someone from posting their solution just because the problem was posted a long back.
It's hard for new users to understand that the lifetime of content on needgap is very long, Solutions are needed for a problem posted two years ago because the need-gap exists. Unfortunately, limited attention and instant gratification nature of average Internet content today makes it difficult to run home this point.