I haven’t met any anti-vaxers who still get flu shots unless it’s the people who are specifically against the covid vaccines because of them being mandatory and “experimental”. But yeah they definitely benefitted from getting those shots as a kid and even if they didn’t they still benefitted from everyone else getting them due to herd immunity.
Yeah normally I would feel the same way about this FOMO style of marketing but normally in that case it’s the company selling it deciding to like remove it from sale to create the FOMO need. In the case it’s another company basically forcing this decision on them so I don’t think it’s bad to let people buy it for cheaper while they still can.