When people say "Kodak has a (practical) monopoly on colour film" they mean just that. Digital is not an alternative to film if what you want is to use film.
And I think "practical monopoly" is a perfectly viable description.
Fuji is the only maker as of February 2025 that compete with the quality of Kodak color film, but as I understand it they have all but exited the color negative film game(with current Fuji consumer negative being rebranded Kodak). Fuji still has two or maybe 3 color products in their portfolio(I've lost track of Velvia 100 since we can't get it in the US anymore), all of them E6 and at least from reports coming from the US and Europe, availability is sporadic. I know I have a small amount on back order, and the retailers seem to get small shipments every few months, but short of paying huge prices from Japanese seller on Ebay it would be difficult to shoot depend on Fuji for any sort of volume.
Harman and Orwo have color emulsions, but at best they are both several generations behind Kodak or the last Fuji films. I know Adox has made some and is supposed to be working on more, as are Lucky and maybe Ferrania(if they're still around). Each of those have at best one or maybe two color offerings.
Compare that to Kodak, where you have a reversal film, 4 cinema stocks, and by my quick count 8 different C-41 films(9 if you count the 800 speed film in disposables, 10 if you count Aerocolor). If you look at everything color we know about coming out of Rochester, I think we could get to 16 different film stocks if we count Cinema print film.
There's no contest, plus the Portra, Ektar and Vision films are basically as advanced as color gets. The others are special purpose films(Aerocolor, Cinema print) or less advanced films that are a bit more budget friendly. Best of all, too, if any of them are out of stock, more is usually just a shipment away, or maybe shopping around to a different retailer.
Someone who wants a color film work flow and needs to be able to consistently deliver results IMO would have a difficult time using anyone other than Kodak at this point. Maybe some of the other makers will get to where their products are competitive with Kodak, maybe Fuji will become more consistently available, but whatever happens I don't see it as being a short term answer.