i go back and forth on whether or not to send people who have ghosted me in the past birthday wishes. my heuristic is that if the birthday is <6 months since ghosting and the personal relationship was >1 year, then I send well wishes into the void, otherwise no.
“Freedom of the mind requires not only, or not even specially, the absence of legal constraints but the presence of alternative thoughts. The most successful tyranny is not the one that uses force to assure uniformity but the one that removes the awareness of other possibilities.” —Allan Bloom