You can just buy your own domain and put the relevant dns records to forward it to any service that supports it (generally costs some money though). Then if the service enshittifies you just need to change the dns records. No need to go the full selfhosting route.

I use tuta for that, haven’t had issues so far and also don’t think I’ve heard anything bad.

You’re thinking of net profit margin. Gross profit margin will vary by item but 30% is a pretty normal amt there.

The most specific number I could find is best buy averaging 22-23%. Which is a bit lower but same ballpark.

Data ownership and privacy absolutely, within an enterprise license. They very deliberately make you pay for that.

While it’s hard to prove they’re not just breaching contract and training on it anyway, I don’t think it makes sense to assume they are.

Retail stores also take like 30% usually. People don’t give a shit because it’s not unusual and any option that takes less is worse in some way.