https://wccftech.com/half-life-series-free-until-half-life-alyx/

Not sure why everyone is so worked up about the upcoming Half-Life: Alyx? The last new Half-Life game was released nearly 13 years ago, so there’s a lot gamers out there who have probably never played the series. Well, it seems like Valve may be planning to give folks an easy way to catch up.

According to a number of people on the Half-Life: Alyx Steam Community, they recently received a notification that the "Half-Life Collection" would be free-to-play until the release of Alyx in March. Apparently, the notification quickly disappeared, but, of course, the Internet never forgets. Here’s a screenshot receipt from a poster on ResetEra.