Broadcast has never been Star Trek's friend.
The very first pilot was canned by the network.
TOS was almost canceled after only its second season and was eventually canceled after its third.
TAS was canceled after only 22 episodes despite winning an Emmy.
VOY struggled to its seventh season, network ratings split between broadcast and syndication.
ENT limped into its fourth season where it was finally canceled.
Only TNG and DS9 were truly successful thanks to being available exclusively in syndication and not at the whim of network executives.
Putting Trek behind a paywall certainly hasn't hurt the franchise.