Just wow for this post! I am very much impressed because there are some facts which are actually making the failures amongst startups. I have heard/read almost all of the examples given in the OP and yes I have seen them failing. OLX is closely related to me as I have used it multiple times. The website is working till date but it's presence is next to zero. It's like surviving on it's final breaths these days. However one thing is sure, there are bigger players in the market as compared to them with bigger budget to spend on management and marketing etc. It's beautifully written article and every startup must note down them to save themselves from failing.
Indeed that OLX is still breathing and it's also true that they lack of marketing because I didn't see them appear in the ads online other than those recent companies whose concepts are also similar to theirs (buying and selling). I think that is a sign that their company's budget is getting low but did you know that OLX is one of the biggest buy and sell site before? I remember they are being advertised left and right and they even have advertising on the local television. That's how successful they are but unfortunately, they ended up on this.
It's not that the saying is true that all good things has an end because there are also old companies which are still at the top up until today. Maybe they only got carried away of their fame and then they start doing things which are inappropriate. This is a common mistake of those who experience a success.
OLX in my area is now a little dim because it can't compete with other startups such as, for example, Shoppe, Tokopedia, Lazada, TikTok they have started well and can survive until now so there are many enthusiasts because of their extensive marketing and the features that are expressed are so good. that is felt by the community and this has become a lot of people's choices for buying and selling at the startup.
There is a friend of mine who uses OLX, he sell/buy used cars, but he said OLX is now not like it used to be that many enthusiasts are now left behind so that the buying and selling they trade there is no longer a buyer, it becomes quiet and it is difficult to sell there, but that's a little Complaints about failed businesses for small circles, any of them are still basically we ourselves can do several things so as not to fail.