The math works for me since it’s the fastest and most convenient way to meet spend (usually around $3k)
For a $3k rent payment (mine is less than this but as ex to meet spend), you’d pay a $75 fee, but earn the signup bonus + 3075 points. Depending on the credit card, 3075 points is likely at least worth $30.75 if not more, so your net fee is $44.25 or 1.475%, which is not bad IMO.
Otherwise, some landlords might let you pay via credit card.
Disclaimer: I have been a satisfied customer for them. I do not work for them or get any kickbacks.
If you are spending to earn a bonus, e.g. 50,000 points for spending $3,000 you are earning 16+ points per dollar (1 point is generally around 1%, sometimes better).
(But only for donations you're making anyway, and only when fees really are waived.)