Your personal security concerns are valid but every company is different, and it seems most people don’t work at a firm their whole lives anymore so there is less trust and less loyalty and decency, really. In my case the wifi given to employees for their personal phones is totally segregated from the work LAN so while it is definitely monitored and protected in the same way, its far less of a concern for company security. It is also throttled so watching videos is almost impossible, it blocks a hoard of malicious stuff (which makes using it safer for the user than when they leave), and many of those using it are on cheap limited plans so they might not be able to leave their comms open to their family or check the location of their kids during the workday, or even get updates otherwise. Many use it to stream radio stations or listen to podcasts usually into earbuds. Properly classified porn sites, etc. are blocked. However, I recently heard there will be changes imposed on us from above and all these users may soon be kicked off this wifi entirely. Managers and office workers will certainly be still allowed to use it but the people who really need it? I guess they are SOL.