I think a lot of companies view their free plan as recruiting/advertising
if you use TailScale personally and have a great experience then you'll bring in business by advocating for it at work.
Of course it could go either way, and I don't rely on TailScale (it's my "backup" VPN to my home network)... we'll see, I guess.
I once heard a native English speaker pronounce it as "the printer kweeyee."