By developed, you mean taking a Western pop approach to its music. When you adopt dancehall, soca, rnb, cuban rumba, rap and house sounds into your music then it becomes way more palatable to Western audiences. It isn't just because there are more platforms to reach a wider audience. Even still, I don't see any African nation having any kind of run similar to what we've seen here in the States though I do enjoy Afro pop.
Indeed AAs music (since that's what we're really talking about in this thread) has benefited from US corporations and the general economic attractivity the US presents. That's why countless South Americans and Caribeans immigrated to the US and brought their culture with them, same with people from other continents. So in turn those elements are incoporated into "AA" music, so indeed it is obviously more relatable for those who stayed in those countries for example. But the reason it happened is because those people were attracted by the US market, and/or AA artists had means to access music (Madlib, Timbo, Dre for example) from outside the US and use it. That's a direct consequence of the US being the world first economic power, and of AAs being Americans.
Music is an industry, so as I said with the backing of US corporations it's quite easy to understand why AA music would be huge worldwide, plus the use of english. It's easier for an Italian or a Nigerian to have access to mediocre Lil something mixtapes than it is to have access to a quality album from Portugal, for example. I think some brehs underestimate the role of the US economical power and overall influence in the world. While for example Micheal Jackson would've been huge regardless because of his talent (same as for example Bob Marley, who indeed had to use the UK and the US market to explode, and had the advantage of singing in english), I think some other US stars (AA or not) benefit from that "natural" stimulus package which comes from being from the US. Same with Hollywood, to take a non AA-dominated sector.
The AA influence worldwide is huge, but it's not everything tho : it's still mostly limited to other Blacks (and def not all of them) and to some White people who are "down". After the big names like 2pac, Beyoncé or Kanye, the influence is much less important. People might LISTEN to a lot of AA music, but that's where the "influence" stops. So yeah a random white French guy will know Beyoncé, Drake and YT, but he will still dress/talk/live like any other random white French guy. Might just throw a dab out of nowhere here and there lol. In Europe Tv Shows/Hollywood have more influence than AA music nowadays imo. It had more influence in the 80s and 90s I think, even though it's ironically much more mainstream now, go figure. AA music is close to that rock/pop area now, in the sense that it's not much more than music, no longer a "culture". Most people listen to Drake like they listen to Lady Gaga. Where I do see a rising influence is in the arts, graffiti/street art is HUGE in Europe now and in dance, where breakdance is now routinely integrated in "mainstream" shows. Ironically, those are two aspects of HH that seem to have been all but abandonned by HH, from what I can see from afar.
Indeed no African country will have such a cultural run, until said country has the internal market, economic attractivity, cultural industry to back artists and linguistical reach as the US. No one's going to be a worldwide star speaking Bambara, Wolof or Lingala. But if you know anyone from francophone Africa for example, I'm pretty sure they will tell you that music from DRC and Côte-d'Ivoire have at least as much influence in their country as AA music. HH is on the rise there, but it's still not bigger than local forms of music. I have a friend who had some DJ gigs when living in Dakar and he's the typical influenced by AA music breh, but when he got there most people were telling him to put Senegalese, Congolese, Ivorian music or stuff from Cabo-Verde.