That’s ridiculous, you’re conflating productivity (due to slack and meetings, I assume) with fast internet access.
You need to install potentially large packages and images, commit code, and be clear in meetings - that’s a minimal standard for software and if someone can’t do that because they’re on some crazy kbps internet then they’re not suitable for the job.
I live in a country with fast enough 5MB/s and huge ping (300ms+) internet. There is no problem with installing packages, downloading deps and so on, but realtime remote typing or gaming could be really clunky.
Don't forget that you don't need a fast ping for development (with local env). "Good internet" is a very broad definition.
You need to install potentially large packages and images, commit code, and be clear in meetings - that’s a minimal standard for software and if someone can’t do that because they’re on some crazy kbps internet then they’re not suitable for the job.