[saiya-jin]

Only if you do few most touristic places in whole range of alps. Most of it is quiet and you will meet few people a day. But sure if you pick one of the most popular hikes in alps then its surprisingly crowded, especially in the summer. Autumn is far superior time for Alps hiking (colors, temperatures, weather).

Also don't get that camping restrictions rant in this thread - you can camp literally everywhere outside of natural reserve. If its private property and you have somebody to ask then ask for permission. Otherwise be polite, quiet, don't leave anything after you and that's it.

I've been doing it for last 10 years almost every weekend weather permitting, never any issue. Outside of proper alpinism / skialpinism never used huts.

[la_fayette]

You can do it and get away with it, however it is absolutely forbidden in central europe, except Switzerland... biwaking is only allowed in emergency situations. If you are caught you might have to pay high fines...

[FDSGSG]

You will never be "caught" unless you camp somewhere inappropriate or make a mess