Is is safe to use WD40 as a matte paint protector for a carbon bike? I like to take care of my bicycle and clean it regularly.

After a deep clean I would use Muc-Off Bike Protect to protect and preserve the matte paintwork. This works, but is pretty expensive. I do notice the distinctive WD40 smell when rubbing this solution into the frame, forks etc...

I wonder if the branded Muc-Off spray is essentially a similar formula to WD40 with the addition of a higher price tag or is there something in the Muc-Off formula that isn't present in WD40?

I am concerned that if I use WD40 on my new carbon frame and forks to preserve the matte paint job, it could ruin the pain job?

Has anyone tried to clean/preserve the matte paintwork of a carbon frame with WD40? If so, what were the results and would you recommend it as a cheaper alternative to the Muc-Off product?

Muc-Off Bike Protect link: https://muc-off.com/products/bike-protect
There's not really a generic answer as not all finishes will react the same way to a given chemical, especially over time with repeated application. WD-40 has a bunch of naptha, which generally speaking you want to keep away from paint you care about. It also leaves an oil coating behind that can attract dirt, which is ugly and potentially bad for the finish by itself.

Just use one of the many silicone cleaner/wax/protectant products. Silicone is good because its whole deal is it doesn't harm any finish type on bikes, regardless of specifics.